Apparently Mr Blair had ambitions of being a rock promoter:
LOCATING A HISTORIC VEHICLE: Prime Minister Tony Blair's Rock Van
We were contacted by a TV Production Company who were going to make a programme about Prime Minister Tony Blair's pre-university period when he was heavily into trying to become a rock promoter-star. During this period he purchased a Thames van to move the group Jaded round gigs. TV people were trying to find if the van was still around so they could use it in the programme. Regretfully we could not help and eventually a similar white van was used in the programme on Channel 4.