I use Currency Direct and I've never had a problem with them. I can tell you I was scared at first sending large amounts of money to an unknown middle man. But I have used them several times since without any hiccups or delays. The more you transfer the better the rate, but as the rate is so low at the moment only move what you have to. Unless of course you feel the market will get worse before it get better.

Currency Direct don't charge commission on a minimum of £5,000 and my Sol bank does not charge any transfer fees.