UK firms have given a mixed review of David Cameron’s plans to reform the UK’s relationship with the European Union.

In a survey by the British Chambers of Commerce (BCC), 54 per cent of businesses said they would back proposed changes to the relationship the UK enjoys with the EU bloc.

But just under one in five said they weren’t sure whether it would be good or bad, an increase of 80 per cent compared with the same survey delivered this time last year.

In general, businesses tend to think the UK should stay in the EU, with 61 per cent agreeing it is beneficial compared with only 12 per cent thinking a UK withdrawal would be a good idea.

John Longworth, director general of the BCC, said: “In the space of a year, business opinion on a renegotiated relationship with Europe has started to cool, and more UK firms are gradually stating they ‘don’t know’ how this would impact on their future prospects.

“As voters head to the polls for Euro-elections here in the UK and across Europe, the increase in businesses who say they don’t know how these potential scenarios will affect the UK’s future should be a wake-up call for Britain’s political elites."