[pups] Suitable PDP11s, in the UK

Having long ago got rid of my collection of ageing British (super) minis, I realise I'm missing them, though I'm not sure why. I can't pretend any more that something running 4.2BSD is really practical, so I'd like to get something really impractical, like a pdp11. What I'd like to be able to do is run 7th edition or thereabouts and/ or 2.11BSD on something which is not too large (so full-height 19" racks are out). I'm not interested in emulators. It looks to me like there are such systems - for instance the recently-discussed 11/23 (or 11/73) looks practical, other than being in Utah. So I guess I have two questions: Firstly is this a practical thing to do in terms of reliability of HW etc? I finally gave up on the previous lot of machines at least partly because disks &c were just so flaky that it was too painful to keep things working (also we're talking full-height 19" racks in some cases so they were a bit, well, big). I don't want to spend my life trying to source ancient disks etc (though I'm clearly not expecting things to be as reliable as good, new modern kit). Secondly, does anyone in the UK (may be there is no one but me, of course...) have any hints where I might look and what I might expect to pay. I've looked on ebay but I'm a little nervous of what I might get that way. Thanks --tim