Nice set of conquests. You got an Acorn A420 for £10, wow that really is a bargain! Usually the A3xx and A4xx machines go for much more than that.

I'm reckoning your LCD TV didn't work with the IIGS as it won't be syncing at traditional CRT TV frequencies, which is what the IIGS outputs. I use a Philips 8833 monitor with my IIGS (it is basically a TV without a tuner in it, but with a load of AV connectors).