Buying a new flat. Should I pay for these repairs? (or are they trying to rob me blind as usual:D)

Hi,
I've just had a specialist survey done on a flat (built circa 1890)
that my Fiancee and I are trying to buy. He came back to me with;

1) An "active" infestation of woodworm in the roof and floorboards
2) Damp behind a sealed up chimney
3) Damp in a window frame
4) Wet Rot in the bathroom, which they'll need to take the bath out to
fix.

He quoted me £2800 to fix all of this in a 1er, but how much of this
could I deal with myself (I'm o.k. at D.I.Y., but more tenacious than
skilled....), and which points are likely to stop the mortgage going
through? I would imagine that if there are woodworm, the mortgage
company won't be too happy, so he quoted me a grand for that.

Any thoughts would be much appreciated,
cheers,
Jon

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