I collected literature through the 1970s' into the 80s' with a pal. Recently he started to sell his collection on e-bay and raised a lot of money. The interesting thing is that flash cars do not get much interest and have little value, probably because every kid got their hands on them, however, agricultural, plant and HGV are rare and prices are into tens, 20s' and sometimes 50's. So if you have a collection and you start to DRIP-FEED it onto e-bay you will soon find yourself with over a hundred quid and depending what you have and how much of it, a thousand. Because I collected more agri/plant/HGV, most of it now sold by my old pal for me, I have certainly had a grand back, which I have spent on buying the real things and made work !
Hence the Wuffler, finger bar mower, bailer, ploughs and arable equip has been paid for from literature sales.
Never seen any Bamford literature.