To think this vendor is out of order?

[Kittlewittle]

I put an offer on a house, and after negotiation, where it was increased, the vendor accepted.

Solicitors have been appointed and the conveyancing process is well under, but it is taking time due to some complexity of the purchase.

The vendor is now constantly asking me to increase my offer. I said we can't, we cannot afford to, but I am getting constant requests.

I have ignored the latest one.

Aibu to think that once an offer is accepted, the time for negotiation has passed?

Ha yes! They said the agent had told them there were few buyers currently. Yet this is still going on.

This is very standard and goes both ways. It's common for buyers to ask to reduce the price after their survey even when nothing really concerning comes up or it points things they were able to see or were told.

Buying is a gamble and many sales fall out until exchange. You've got to decide how much you want the house vs how desperate they are to sell quickly and call their bluff.

I would ask the estate agent to have a word with them. Alternatively at every request to up your offer I would counter with an amount lower than your original offer.

Have a firm word with the estate agent - the offer has been excepted and that's it. Tell them you want confirmation that your offer is good and you will step away if they persist in asking for more. Tell the agent as they has a vested interest in getting the sale to complete. The solicitor doesn't have the same pressure. In fact you can ask the estate agent to arrange viewings for other properties if they don't stop.

Just be aware the solictor may charging you for each communication

We are in England. I would prefer the Scottish system where there is a binding contract when an offer is accepted: and both the vendor and the buyer need to adhere to it, otherwise there are penalties.

I wouldn't offer less either at this point, as that would be poor form after an offer has been accepted.