Currently on e-bay is a J type van petrol tank.

http://www.ebay.co.uk/itm/ws/eBayISAPI.dll?ViewItem&item=260827807286&ssPageName=ADME:B:EF:GB:1123

Also on e-bay by the same seller are a pair of GPO rear doors.

http://www.ebay.co.uk/itm/ws/eBayISAPI.dll?ViewItem&item=260828234319&ssPageName=ADME:B:EF:GB:1123#ht_500wt_1023

I met up with P.W. last weekend and he informed me that his J type TSL 577  has had some work done to the engine and a new clutch fitted. Shortly after the re-build the fan belt parted company.
The van has been invited to take part in the South Bank celebration of the Festival of Britain 60th Anniversary over the August weekend of the 13/14 TH. Look out for the van if your in London that weekend.