Bit of progress......bought an offcut of "Dark Blue" pigskin suede off eBay to cover the Tornado. Sat it in my watch list and a few days later got an offer of £4.50 from the seller. Took a punt as it looked like black in the ad and sure enough its black enough for me. 0.6mm thick too so nice and thin.
Broke out the Evostick contact adhesive and the Tamiya silver paint for the lettering. A brand new stanley blade made light work of trimming duties, especially around the rear block with the Tornado lettering on it.
Tornado saddle with the donor foam from the cheaper eBay Iscaselle saddle stuck to it.
Light coats of spray glue applied to both the suede offcut and to the saddle.......left to flash off and go tacky.
Pulled the suede down over the saddle, pulling and stretching the suede to smooth out any wrinkles. I masked off the underside of the saddle/rails/tornado badge as I was using spray glue....I think next time I would probably get some brush on glue for the underside of the saddle where the suede wraps around and gets stuck down.
Used a screwdriver to push the suede right into the crevices around the badging at the rear of the saddle prior to trimming back with a stanley knife. Important to use a brand new blade as a super-sharp blade will result in a nice neat trimmed edge. Refitted the plastic trim piece at the nose of the saddle underneath which hides the suede that has been tucked under the rails right at the front of the saddle.