I asked a few other drivers and went to a recommended quack who did the PSV/HGV medical for £25. Incidently this is valid for 5 years c.f. 1 year for the JAA medical.
QNH 1013,
Always worth haggling / shopping around to get the best deal.
QDM
(P.S. Tell me who the scab was and who did it cheap and I'll have him drummed out the union
)