I dont do any investing in the UK or the US at the moment but would like to do so in the months ahead.
On the Offshore account front, my husband and I use Lloyds TSB Offshore on the Isle of Man - we have a linked Pounds Sterling / US Dollar account. Deposit dollars into US Dollar account, do internal transfer from USD to GBP account (takes 24 hours, can do it 24 hours a day, best interest rates, no transfer fee, no commission on exchange rates), and voila - UK "based" account filled with cash
We've been with Lloyds TSB since August now and love them to bits. Always helpful, lowest minimum balance requirement of all the offshore providers, and also the lowest yearly fee.
I do believe that have some excellent investment options as well. I get their regular newsletter called Shoreline and its always packed with great information for investers. Actually I was eyeing up some of the special bond rates they detailed in their last issue. Their site has some great information.
HTH
Sarah