I'll see if I can get some photos sometime soon.
The thing has been in the shed neglected for a few weeks now so any short term surface finish will have been lost.
It is a rear rotor, I presume it is on the outer face, but until I have a look I can't be sure. No brake ducts, DS2500 pads. Rotors aren't that old, but have done a few events. They aren't worn by any measure, although I will put some micrometers on them when I get a chance.
Just sell me your F40's Roy & everything will be allright.