Cool. Thanks for the reply Kev.

I actually want to keep the fuelling standard (as much as it can be with a K&N filter, chopped and 180 degree rotated snorkel and now a single MTC can).
Just didn't wanna pay OEM prices for a suspected duff sensor! (Bike running rich and has done 95,000+miles).

When I know I've got " 1, 2, 3, 4, 5.........sensors working overtime"!! (XTC) if there's still fuelling issues then I'll see what's worth doing.