Another inconsequential update.
After yesterday's ride I noticed the headset didn't feel quite right. In the absence of a correctly-sized spanner I'd tightened it up by hand using a bit of innertube for better grip but it still felt sloppy. Last night I unscrewed the whole upper assembly, cleaned the thick, sticky, dried grease from the threads, re-lubed with some thickish chain oil and reassembled. This time time I got some obvious engagement with the bearing race - I think previously the cap was hanging up on the mucky threads, so that's another little job done.
Afterwards I went out for another ride around town which really brought home how "imperfect" the saddle is. Thanks to my long legs it sits far too far forward, meaning the best I can manage is to have my sit-bones perched right on the rear of the seat. If I relax and overcome the obvious lack of contact I'm hanging off the back of the saddle and could conceivably push right over the edge..
I think the saddle could be reasonably comfortable in the right place, however this is a moot point since this isn't possible .By the time I got home (from probably 20ish miles cumulatively that day) my arse was so sore I was having to push right forward on the saddle to make the remainder of the journey bearable
Musing over the issue in bed I cast my mind to the butchered cheapo "Professional" bike sat out by the bins awaiting the next pikey trawl of the area.. this morning it was thankfully still there so I robbed the seatpost and saddle assy; which (just like the wheels and cassette) are compatible with the 25yr-older Raleigh
I ended up swapping the Professional saddle onto the Raleigh's seatpost; it's manky as fook but the separate clamp positions the saddle a little further back, and also accepts a more conventional twin-rail mount than the Raleigh's integral setup.. so will allow me to fit a wide range of alternative saddles should I so desire.
In addition to being a little further back the "new" saddle is fat, soft and sprung so should hopefully be a bit kinder to my back end! Hopefully it'll make the bike a bit less appealing to thieves too
Ideally this won't be a long term solution, but for now it's welcome if it makes the bike more comfortable / tolerable.. I'll hopefully get to test it out tomorrow