Why not to buy from Poland?
Im not dure if you always find you are looking for,when buying a used Lorry,but why not also look at the Continent?
Off course it may come more expensive to get them over then buying here,but not always. Especially if you catch one at an Auction,and you may get a Series you just cant find here. Think a 9X8 for example which is very rare in UK.
With a bit of Luck you also could find a British Lorry
mascus.co.uk/Transportation/ … m0qtg.html
mascus.co.uk/Transportation/ … untry.html
or Germany
dtt.be/en/truck/list.phtml?start=40
dtt.be/en/home/index.phtml?g … tAod3nILfg
Uhh,… They are f**** expensive
a 1998 6x4 £20000.- ruffly
dtt.be/en/truck/detail.phtml?id=21822
a 1990 8x6 £20000.- ruffly
dtt.be/en/truck/detail.phtml?id=22415
and it gets worst 
a 1997 8x4 for 322000.-
dtt.be/en/truck/detail.phtml?id=22060
a 2003 6x4 £23000.-
dtt.be/en/truck/detail.phtml?id=22349
a 2002 6x4 £24000.-
dtt.be/en/truck/detail.phtml?id=22349
a 2008 8x6 £70000.- ruffly 
alibaba.com/product-free/122 … truck.html