They are now sold by the Random Co.
Should be able to find them at www.ducksback.co.uk
I ordered a size 6 22'-24' fro my 5.3 and it's too short - won't gather round the A-frame. They were prepared to take it back IF it was folded exactly as it was originally! That's proved beyond my abilities.
If anyone one want a brand spanking new size 6 drop me a pm.
I also have the e-mail address of their sales chap - pm me if you want it.