Businesses in Hounslow are split over the possibility of a Brexit, a new survey suggests.
Hounslow Chamber of Commerce asked 8,000 firms across the borough about their views on the upcoming European Union referendum.
Just over 500 companies replied, with 45.4% saying they wanted the UK to remain in the EU, 42% preferring to leave, and 12.5% saying they didn't know.
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Stephen Fry, chief executive of the chamber, said the survey was the first of three it planned to run in the lead-up to the vote on June 23.
"The worrying thing here is the size of the undecided businesses. This reaffirms that businesses really are not informed enough to decide one way or another," he said.
'It will be a step into the unknown'
"It's our job to inform. We want to make sure businesses know exactly what the issues are. I'm not entirely convinced either side (of the debate) has done enough to make sure all the facts are out there."
Mr Fry added that some firms were concerned about the impact either outcome could have on tourism and business coming through Heathrow .
"There are concerns there may be a drop off in trade with Europe. It will be a step into the unknown and some businesses are frightened," he said.
The chamber also plans to organise two business forums where company owners and their staff can discuss the merits of staying in or leaving the EU.