Difficult tp say Mick...Possibly hardest to find are the "golden Arrow" and the "Airship R101...easiest being Admiral Rodney and maybe the "Supermarine Spitfire"... Nigel sold a nice Admiral Rodney for £127.recently a bargain I think...... I paid £450 for the Golden Arrow ten years ago this was last tin of this set bought ..Most came under £50
The other set of six, Dick Whittington etc I found the hardest to find of all the twelve.
.All are 1930s toffee tins