Hmm. I would think that such things are fairly routine when buying a second-hand house - there are *always* things like that on a survey - and unless money is desperately tight, I wouldn't drop the offer.
But that's just me, and I evidently have too much money to play with.
Couple of things to consider, though:
(1) Had you topped out on what you were prepared to offer on the house at your purchase price? If not, does the top price you'd set, less the projected cost of repairs, exceed the price you agreed on? That's how I'd establish whether to drop the offer.
(2) Are you prepared to walk away - really, truly walk away?
(3) What's supply like in the area? Are there many houses on the market, was your agreed one on for long?
A sale that gets nasty, even if you get the house at the reduced price, might not be worth it - you might lose the extra money on the fixtures / fittings / white goods that they decide aren't included, the cleaning / paint patching / minor repairs they don't do, the vitriol in the next-door-neighbour's ear ...
I think it's a rather different situation when there are major works that wouldn't be immediately obvious, or the price of which you can't be aware of prior to survey - but where it's a second hand house which is otherwise, presumably, in good condition, I think that's just part of the maintenance you should expect.
Whatever you decide, good luck with it! And I hope you'll be happy there.