u/4orangeteslas

I’m a first time buyer that has had an offer accepted on an apartment for 230k in Nottingham. I had originally offered 220k, but was told that the seller would not be interested in any offers under the 230k. This afternoon, my mortgage advisor called to tell me that the lender that had approved my application had completed their valuation with an estimate of 185k - a 45k difference. Since this is a significantly lower amount, It’s in my best interests to negotiate a lower price, but when the seller has been so firm on what they want, how should I go about this?

I’m not sure of what steps to take next. Has anyone had a similar experience?