[Closed] House survey thrown up some surprises.

Basically exchanged on a house and got a full survey done last minute due to valuation suggesting damp. Survey now returned showing a few issues, damp, some cracks in walls etc (Victorian terrace) with approximate cost for remedial work costing roughly 20k.
Slight post brexit slump plus summer slow down, estate agent sending his % slipping away is on my case to transfer funds for deposit. Survey has changed the game a bit.
Walk away, lower offer?
What would you do in my shoes?