Picked up this today.
After a fair amount of searching I finally got a van that fits the bill. It's a 2005 Citroen Relay, 2.2 LWB hi top. 100k on the clock, 12 months MOT, full service history inc cam belt just done for the sum of £1600. It's got plenty of room inside and already ply lined and pretty clean. Few knocks and scrapes here and there but nothing too bad.
Keep them peeled for updates over the winter.