Suntour XCM chainset & 73mm Shimano bottom bracket to fit, £15 posted
32T Raceface narrow-wide chainring, NOS £15 posted
(or the two together for £25 posted)
Black 105 5501 rear brake, complete with barely used pads and holders. No scuffs or anything. £15 posted
12-23 8 speed cassette, lightly used, £10 posted
Also 'tripleiser' rings were available, a middle ring with extra long tabs which carried the inner and saved drilling the crank arms.
TA certainly did them in 135mm PCD (and 130 if you like the fishing tackle stuff 🤪), not sure about 144mm.
Interestingly it's only recently that scientists have been able to demonstrate that bubbles rising in ponds can charge up and produce micro-sparks, leading to ignition of marsh gas. This phenomenon has been widely reported for centuries as Will O' the Wisps, but at last has been fully explained.
Which would imply that aliens are so bad at flying (or their ships are so dreadfully unreliable) that it's amazing they get here at all!
Alternatively, if they have the same levels of accidents as civil aviation then there are millions of them.
Neither stacks up really in my mind.
However, UFO...