Call it a tenner and I'm even prepared to post it
Note - this is for a manual tensioner only, the auto-tensioner belt is fractionally longer. Earlier Elises generally shipped with manual tensioners, we think, but you should check beforehand. I know ... because it caught me out!
Obviously fine for any 1.8 K series with manual tensioner so probably viable for MGFs, Rovers, perhaps even the odd Se7en?!
Campbell