yeh the mpg is displayed under the rev counter.
As said you dont have the trip computer in that case.
He already said he has the computer as it shows in the rev counter. I had a 98 S plate back in 2002 and indeed the early cars don't have the red pixel computer display like the later cars (2000 model year I think it changed). What should display in the middle part is low fuel warning and low screen wash (if winter pack fitted). These light up yellow with a "beep". Hope this helps...