on my 2001 3dr petrol fl the v5 states no. of seats 6, i have not seen a boot seat available anywhere, is there one or is this just a mistake by dvla. please no wise cracks that the sixth seat is the rac mans when towing it home

Sure these were only available as either 5 seats or (as i'm sure i will be corrected) 4 seats, the V5s are not always correct! just ask them to change it.

Changing your vehicle details on your registration certificate : Directgov - Motoring