Thanks for everyones suggestions, it's so helpful to hear how others are tackling the big move. I'm in the process of getting a quote from Robinson's as a couple of you have mentioned them. We have had quotes from ReloUK and iMove International, very friendly & professional on the emails and competitive in price, however the reviews for both are a real mixed bag from very positive to a total horror stories.
Looking forward to hearing back from Robinson's as their online reviews seem to be very positive.