It's worth a cheap punt, but it's not an original Rothmans SP paintjob, the NSR decal should be on the top fairing not on the inspection panel, it should say sports production and SP underneath too, the gold stripe on the seat unit is too low, it should run under the seat a bit and the wheels aren't Magteks so you've got to cast doubt on it being an SP at all.

Caveat Emptor
_________________
Please do not PM me technical questions, if you can't find it on the Forum start a thread