In reply to JLS:
> I just double checked. It was the correct site. It has a warning saying about changes in the recent budget meaning the cost on the paper work is now out of date.
Looks like that could be the explanation. I couldn't find the warning about the cost on paperwork being out of date but the official DVLA site does give the cost as being £245. I also found this link giving the same £245 for cars registered before 2001 and stating the rate applies from 1st April this year:
http://carfueldata.dft.gov.uk/new-vehicle-tax.aspx?t=23ude39
Thanks to everybody who replied.
Post edited at 06:20