We're with HSBC and they have a special 'Client Account' facility which we've operated all along. If you speak to them and explain what is is that you want the local small businesses manager should be able to guide you through the process quite easily. I'm not aware of any other High Street bank that still offers this facility, though of course Solicitors use it all the time.
At our Real Audit, it actually took them by surprise to see that we'd been doing properly from day 1 - we have stopped doing any domestic work (not done any since November / December last year) and Real still insisted on Auditing us this year!
Our commercial clients like the fact that we operate a specific Client Account with HSBC rather than some third party escrow company that they've never heard of.
The commercial market is still reasonably bouyant, and a lot less fickle than the domestic, it just that you have to have deep pockets to manage the cashflow!