hi im after some info on prestwin wagons (the Dapol kit wagon or wrenn one), what id like to know is,   when was the last of these withdrawn from service?   what did they carry?   were they all painted bauxite?   were the unloaded the same was as presflo's, using air?   what was their main area of operation or were they pretty much country wide?   and are there any decent colour images online some place?   thanks in advance.   dan