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Thanks for that.
And thanks to everyone else who has contributed as well.
I have emailed an electrician recommended further up, and asked about the EICR and a quotation for a rewire.
I also forgot what the bay window was like - it's actually individual windows separated by brick pillars, with a shared window sill, so it would not be replacing more than one window - hence the low quote.
The roofing work actually shouldn't be massive either - a climbing plant has forced some flashing away from where it meets a wall, and it needs banging back down again (technical term, sorry) and maybe repainting.
tbc
@Greenbank
(Not an electrician but have experience of friends rewirings...)
A new consumer unit will probably require a rewire anyway (if the wiring is quite old). The RCDs and MCBs are a lot more sensitive and old wiring can often lead to them tripping all the time. Also, old wiring usually has too few circuits and modern day life puts a much greater load on those circuits than was originally intended (more devices, greater individual power demands, etc). Replacing the consumer unit alone doesn't solve this problem, only a rewire does.
The EICR mentioned above would remove all doubt.
Don't forget that rewiring generally requires redecoration too as there's a load of chasing new cables into walls/ceilings/floors/etc. It's also an excuse to future proof your home with networking and capacity for other stuff to be wired in (Sonos, etc).