Keith and Joe,
Two glorious posters and a pity you didn't stretch a little higher on e bay Joe!
I think I have seen another of that Johnston Harvester poster up in Canada somewhere with a collector but I've never seen the Challenger
It's astonishing how these days the prices of posters and signs are rocketing up in price. The interest seems to be not just with the marque collectors but with general collectors who have no particular affinity to MH, Ferguson or MF.
Keep digging and lets get some other examples up on here.............