If you can’t agree on the sale price, the matter will end up before the court and the court will set the price based upon the evidence that you both put forward.
However I can tell you now that the joint share of what you are arguing over, GBP12,500 each, is going to pale into insignificance compared to the potential GBP20,000 court fees that this is likely to cost.
Whether the price is genuine or not would depend on whether you get a buyer and whether you get a buyer quickly or whether the property is on the market for months because of its on the market for months, then obviously the price is too high. Simple commercial logic.
There is absolutely no reason for anybody with any valuations to be secretive because if they are being secretive and refusing to disclose them, then you can bet that whatever information they have is unfavourable and does not support their point of view.
The most common reason for such an inflated high price is if they don’t want the property sold for whatever reason or you are looking at buying her out and she wants to fleece you.
Thank you for letting me assist you with your legal question. I am glad that I was able to help.
I am not certain whether that answers the question for you or not, but I am happy to answer any specific points arising from this.
It will be my pleasure to help you again either further with this or any future questions you have