Tdlr; our offer was accepted in mid/late October. £890k, 3/4 bed terrace house, zone 1/2 London location. Our "forever home", we hope. In early December we negotiated £15k off due to survey findings.
There's since been some delay on exchanging due to timing of paperwork on the seller's end and the time it's taken us to exchange on the sale of our existing property.
I'm having cold feet about the price we are paying due to how Brexit shambles is turning out and the fact is we may need to spend close to £150-200k over the next 5 years to modernise the property (can't move into it as it stands).
Would it be unreasonable of me to go back to ask for additional money off, given current market conditions mean we may be overpaying?