Technology companies are warning that leaving the European Union could end up blocking digital traffic and stifling a fast-growing part of the British economy.

That’s because when consumers across the bloc go shopping online, their credit-card details and other personal information often zip across borders to giant data centres in the U.K., according to Bloomberg’s Michael Scaturro.

Companies now want the U.K. government to negotiate a deal that keeps Internet borders open. The U.K. houses about 500 server farms, which is almost 43 per cent of data-center capacity in Europe’s four biggest digital hubs which includes Germany, France and the Netherlands, apart from the U.K., according to data from TechUK.