So I got the new tyres fitted and put the wheels back on the bike in a happily drama free fashion.
Everything seems to work and the ABS light goes out (phew!)
Damaged panel refitted with silver duct tape cunningly disguising the damage
New parts should be leaving Japan about now.
Short test ride suggests I will appreciate the roundness of the profile ........ I guess the old tyres were a bit squared off.
Pics show tyres and a small piece of dense foam found on floor (with AA battery for scale. Is it from the bike and if so where?