Hmm - interesting. We had this option at the Silverstone pumps, but being a mean Fifer I was more concerned with the price difference rather than potential engine damage. I was always under the impression that higher octane fuel would not cause damage, but also would not bring any additional benefits unless the compression ratio was increased to make use of the higher octane rating to avoid "pinking"?!?!
They had this in the silverstone pumps as an option but our lead mechanic wasn't too keen on using it in our STs....
Lead mechanic? He's my assistant!
As DC said it wouldnt cause any damage to the engine but it wouldnt give any gains either. Your car would have to be mapped to take advantage of the fuel and if you did this you would have to run 102 all the time - if you ran 95 or 97 you could do damage. Of course on the standard ford ecu you cant make any changes so your stuck with how ford mapped the car.
In the ST it will quite happily run on 95 all day long. Its a standard engine and isnt highly tuned.