Looks like a great project you've got there Peter.
I'm guessing the boat is down in Emsworth (JBT) at the moment? Not sure how you are planning on getting it back to Colchester but if you're not going to tow it yourself, try these guys:
They brought mine back from Emsworth to Brightlingsea on the back of a car transporter (not towed) for just under £200, which was £100 cheaper than any one else I could find.
Good luck with the build!