Two new inner tubes should arrive, today, for my fixer-up. A slow-enough-to-be-a-nightmare-to-find-but-fast-enough-to-be-a-*&(&(*&-nuisance leak in the back one prompted me to buy a pair. I'll keep the old ones as emergency spares.
The leak is probably the valve but I'll change that later. For now I haven't got a core extractor and I didn't go anywhere, over the weekend, to get one. Mrs Cyclist went into Shaftesbury but I couldn't be bothered to ask her to get one. She can operate all of the 'machines that go ping' and all of the hand tools for patching up broken skin and bones in hospitals yet, perversely, grasping technological ideas that do not involve fixing people is not her strong point. I suspect it's just an act.
Added at 11:35 -
Tubes duly arrived - Slime ones for the winter (hope I'm not being too optimistic) complete with valve core extractors moulded into the dust caps. Where I'll be doing a lot of my riding is Where The Sharp Things Are.
Weight (checked by hand) is a little heavier than I'd expected but I'm not too worried about that.