That Lower Grey Cable looks like it's mauled quite badly. Sounds a bit daft given some insulation is stripped back to bare minimum but I think I'd have to do an IR Test on individual circuits to determine if it's safe. Ideally replace, Self amalgamating tape might help as would a type of Wrap around Heat Shrink Tape but it could be a Fire Hazard or have Nuisance tripping in future. Is that a Cooker circuit, sockets and Lighting or is there anything else?
The building needs to be sealed better from Rodent infestation. They must have insurance?
I’m not sure what the lower cable is, I haven’t invested much time in this. The large cable is the cooker, and the other cable is a lighting feed.
A good section of the building has previously been rewired in pyro following previous rodent damage. Unfortunately it’s virtually impossible to keep rodents out of the void. It’s a wooden scout hut on the edge of a park