SITTINGBOURNE, England — Britain is increasingly grappling with the bewildering economic consequences of its pending departure from the European Union. For one company, Nim’s Fruit Crisps, the impact is measured in the soaring cost of pineapple.

Nim’s dries fruits into snacks served up like potato chips, operating out of a former metal shop in this industrial enclave east of London. One of its best-selling varieties uses pineapple from Costa Rica that is shipped in by an Amsterdam-based trading company.

The pineapple is priced in euros. Since Britain’s decision to leave the European Union — widely known as Brexit — the British pound has surrendered nearly 14 percent of its value against the euro on fears that trade will be disrupted.

Confronting higher prices for pineapple, the company’s founder, Nimisha Raja, recently brought in a machine to replace three workers who used to peel fruit by hand. “I had to cut costs somewhere,” she said.

She could be speaking for all of Britain.

In the 16 months since the referendum that set Brexit in motion, the British economy has weakened in the face of a confounding array of uncertainties. Thrift is the order of the day, along with worries about multinational companies’ paring their investments in Britain.

Last week, the picture appeared to brighten, as official data showed the economy had expanded a tad more than expected between July and September. The growth of 0.4 percent for the quarter, which bested expectations of 0.3 percent, reinforced the market’s assumptions that the Bank of England will lift rates when it convenes on Thursday, using a presumably stronger economy as the impetus.

But some economists fear such a move is premature given Britain’s fragile state. Many focused on plunging retail and car sales as a harbinger of trouble.

The drop in the pound has lifted prices on goods ranging from Italian olive oil to Chinese-made electronics. The rate of inflation reached 3 percent in September, the fastest pace in five years. Consumer spending has dipped over the past year while consumer credit is rising — a combination that often ends badly.

The Brexit referendum prompted negotiations through which Britain and a jilted Europe are supposed to hash out their future dealings. But the talks have proved acrimonious and largely futile. This has heightened concerns that a two-year deadline on negotiations could pass without a deal, subjecting companies that trade across the English Channel with unsettling ambiguities about future rules. The Bank of England has been warning banks to prepare for that very eventuality as one possible outcome.

With the boundaries of commerce unclear, some companies are reassessing the appeal of centering operations in Britain, the former seat of a global empire that increasingly looks like an island nation.

“Clearly, growth has slowed quite sharply over the last several months,” said Peter Dixon, a global financial economist at Commerzbank AG in London. “There is a sense that companies have been postponing investment.”

Britain now stands as one of the world’s weakest major economies, even as Europe, Asia and North America enjoy relatively robust growth. Over the first nine months of the year, the British economy expanded at an annualized rate of only 1.3 percent.

Absent a deal, global banks are confronting the prospect that they could no longer use their London office to serve customers across the Continent. Many have been scouting spaces in financial centers that are firmly within European Union territory.

Citigroup has outlined plans to set up a trading operation in Frankfurt, while applying for a backup license in France. Goldman Sachs recently leased expanded office space in Frankfurt.

In the West Midlands, an industrial reach of England that includes Birmingham, foreign direct investment dipped slightly in the year after the Brexit vote, according a recent assessment from the Greater Birmingham Chambers of Commerce.

The chamber pinned the blame on “uncertainty caused by the outcome of the E.U. referendum,” which was “delaying investment decisions, a trend echoed in other areas of the U.K.”

Chamber representatives have been turning their attention beyond the European Union in pursuit of fresh investment. A delegation recently returned from Turkey. In planning future visits, the chamber is especially focused on cultivating business with members of the British Commonwealth.

“It’s a rewinding of history, overtly looking for trade with Commonwealth countries, rather than with Europe,” said John Lamb, a chamber spokesman. “We really are starting to look at markets in the post-Brexit world.”

At the KimberMills International factory in the Black Country west of Birmingham, workers use tongs to pluck glowing orange blocks of steel from a caldron-like furnace, then pound the metal into desired shapes using a three-and-a-half-ton hammer hoisted by a pulley.

Other workers guide lathes and drills to yield an assortment of industrial parts — rockers for marine engines, clamps for oil pipelines, components for gearboxes of construction machinery.

The plunge in the pound has raised the price of steel the company imports from Sweden, the Czech Republic and Italy. The company has raised its prices to adjust.

KimberMills taps a forge in Eastern Europe to produce large parts that are beyond its works in England. If Britain fails to strike a trade deal with Europe, these parts could face tariffs. The company has already begun seeking out alternative suppliers in Britain.

“Despite everything that happens, there’s a resilience to the British market,” said Larry Joyce, the company chairman. “We just get on with it.”

But on a recent afternoon at the Great Western pub, a cozy, beer-scented den in Wolverhampton, people worried that such sentiments were being overwhelmed by the economic realities of Brexit.

The pub has been doing a brisk business, owing to the success of the local soccer team, the Wolverhampton Wanderers, whose stadium is within walking distance. But customers were nursing woes.

“Brexit is a disaster,” said Richard Lloyd, 48, the proprietor of a local construction company, as he hoisted a pint of Guinness. “It’s thrown a lot of people into uncertainty. Companies are certainly delaying investment. They are being very cautious.”

Two years ago, Mr. Lloyd employed as many as 20 people. These days, he has only four. “If things were going really swimmingly, I’d hire more,” he said.

A local taxi driver, B. Maan, recalled how he used to take home 200 pounds, or about $266, in the course of a Saturday night, ferrying revelers to pubs. These days, he is fortunate to secure 120 pounds.

“People are spending less,” he said.

Time itself has become a threat. As negotiations yield headlines about sniping within Britain’s governing Conservative party, each week that passes absent clarity amplifies pressure on companies to shift people and operations to Europe.

“We can’t see how investment particularly, but also consumption, will not be affected,” said Kjersti Haugland, chief economist at DNB Markets, an investment bank in Norway. “How can you go ahead with big investments when you don’t know what framework will result?”

For Nim’s Fruit Crisps, the variables of Brexit have advanced British self-sufficiency.

Previously reliant on a supplier in Belgium for most of its fruits and vegetables, the company has in recent months found domestic suppliers for every needed variety except pineapple, limiting its exposure to the vagaries of exchange rates. Today, Nim’s buys apples, parsnips, cucumbers and a range of other crops from British farmers.

The fall in the pound has also made Nim’s products cheaper outside Britain, bolstering its exports, which now make up more than half of total sales. Nim’s snacks are sold in Germany, France, Italy, India, Israel and — soon — Saudi Arabia.

“What I’ve learned is that Europe isn’t the only market for us,” said Ms. Raja, whose Nim’s business card identifies her as TheBoss.

Yet as she seeks to complete a deal putting her crisps on the shelves of a major British supermarket chain, Ms. Raja worries that the needed volumes will exceed the capacities of Britain.

“I suddenly have to find 100 tons of apples,” she said.

She is scoping out farms in Poland, even as she worries about the value of British money in a world shaped by Brexit.

“I have to keep my margins tight,” she said.