So, I went to collect the first one...turns out flat screen CRT's seem weigh substantially more than standard curved screens (for some reason). That, and the fact that the picture above doesn't represent the size accurately made it a no go. The second one was gone before I had the opportunity. I then saw an XRGB-Mini on ebay yesterday...which for some bizarre reason sold for around £320....seems crazy when you can get them new for around £290!
After considering the options I think the CRT route is probably the most sensible taking into account all the pro's and con's...these older consoles were supposed to be played on older TV's so that's probably the cheapest and easiest route. I think I'm going to go down the 25" 16:9 CRT route....a good size, not inordinately heavy for one person, although shipping any ebay win will cost a bomb. Mid size CRT's seem really difficult to find these days.