Got the new wheel eventually, Gouvia marina denied having received it so I went cruising for 2 weeks while I chased up Lewmar only to find that it had been delivered two weeks before I got there!!
Got the old wheel off by tapping the nut with a rubber mallet after it was loosened off a bit. Guess what, the folding wheel fits but I can't turnit far as the plastic joining bits foul the top half off the engine instrument panel. This is the Bav 39 with the non standard steering system aaaaaaaaaagh.
I have 2 options, sell the folding wheel - it was the full priced one as Lewmar said the blue leathered one they had in offer wasn't on offer anymore and their web site was in error. They did agree to,let me have it at the offer price tho, phew. Second option maybe modify the instrument panel - a serious consideration, it's only the fuel gauge on the top half of mine so not too bothered about it being at an angle.