I have most of the parts (7445, 74LS00, 74LS20, etc) on the way now and I did find my 74LS157s - I could really do with 4 * RAM ICs though, so I'll PM you about that.
Forum user 'KeithsTV' has very kindly offered 4 * 7408, so if he has no objection I will forward two of those straight on to you.
The ICs I have coming to me were all UK sourced, but it shows in the price - hard to believe that once common logic ICs are now so expensive. Part of my aversion to ordering from China is their great fondness for fakes, there was something odd about the 74LS365 you originally had in the JM PCB, it seemed to be a retopped / reprinted device, as I recall.
Of course there's no guarantee that devices which are already in the UK are not just more expensive fakes.
