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I have recently removed a very similar internal masonry wall in the exact same location in a house of roughly the same size and age and it was definitely not structural and did not require an rsj. Judging by the thickness of the bit thats left, it looks like a single skin of brick, possibly laid on the thin edge?
I imagine the joists run parallel to the party wall and the floorboards perpendicular. Thats how it is in mine and the internal wall had no top plate and wasnt connected to the joists.
EDIT just seen the cracks in the plasterboard from the bath above! looks like it may need a bit of bracing
@Silly_Savage erm didn't really notice anything temperature wise to be honest. But now I think about it, that is a good point. Doors back would be one option or a full opening up like the neighbouring House. The dodgy door with the pipe would probably stay if the former, and the window which is there repairing.
Estate agent hasn't send through the surveys so my offer isn't as high as it would have been. On the internal kitchen wall that needs a building control cert - the agent said 'it will have an RSJ otherwise it would have fallen down'. Without that paperwork, my offer will be retracted in short order