Received the last of the job lots I was expecting. The lot of T-mounts and reversing rings etc. wasn't as good as I'd hoped, the teleconverter that was included appears to be for Canon FD long lenses or zooms rather than all FD lenses, and the M42 tubes aren't working properly, I think someone "repaired" the stop-down mechanism and did a lousy job of it. I doubt I'll break even.
The lenses, however, were very good indeed: for £14.50 including postage I got
A nice old Miranda 50/1.8 (the old external bayonet fitting) with very slight fungus in the front element but otherwise OK and has the original metal front cap
An unbranded 50/1.9 in Contax/Yashica fitting (the lens surround is missing which is why I don't know who made it, I suspect Yashica)
x2 converters for Olympus OM and M42
Two fairly average projector lenses
and a Mitsuki (actually Tokina built) 75-260mm f4.5 close-focus zoom in Minolta MD fitting, in perfect condition. Really working well, and gave some very nice results on my Micro 4/3 body despite lousy lighting. Probably won't sell for nearly what it's worth, because of the mount and because it's bloody heavy, but I'm starting off at £4.99 and I'll see what happens.
Together they ought to raise at least £30-40 with luck, which ought to pay for both lots.
The lens is this one:
https://www.pentaxforums.com/userreviews/sears-75-260mm-f4-5-close-focus.html