Just an update, set the float to 15mm and dipped the fuel level and yes,35mm
Remove this jet
this is the ref. surface
slide the vernier ( OK? Vince? ) down slowly till you see the fuel surface distort ( not easy,you need to peer down with a good light )
and this should be the reading ( 35mm )
John
P.S. I have read of two ways of setting the float height,the correct one is with the float chamber lid held vertical and allow the floats to just close the needle valve but not compress the internal spring in the needle valve..
( bench vise and magnifying glass needed for the over '60s ) , and it's a doddle if you have an electric fuel pump..
Makes me wonder why I ever stripped the EFI off it...