@emmathedilemma
I'm not being funny but if you're so short of cash that you can barely afford to buy a £40k flat then your priority should be on cheap basic home cooking not living off takeaways!!
The OP has said that her friend has autism, mental health problems and struggles with looking after herself - hence her concern for her buying a flat which is going to require a lot of work to be habitable. Only on MN could somebody read a thread where that’s so clearly the point the OP is making and think to comment on the virtues of cooking from scratch and how easy this should be for everyone.
Looking at some of the outlets the electrics may be old enough that the place needs a rewire, I doubt that ancient gas fire would make it through a safety inspection, and the way the floorboards have been patched I’d at least want to check the joists for soundness. The damp is probably because the place is entirely unheated and the window frames have rotted, so not necessarily a structural issue but not a cheap fix all the same.
I think it could be a nice little flat for somebody with £10-£15k to install a boiler and central heating, rewire, have at least the worst of the windows replaced, and do something with the kitchen and bathroom. I don’t think it’s suitable for somebody with little cash to spare who thinks they can move in, give it a coat of paint and manage through the winters with some electric heaters plugged in.
OP, if your friend has family locally, could you encourage her to have them view the flat with her and give their opinion, which might help her decision and to understand their concerns?