Advice needed re mortgage deposits

[Tiddlybear]

Hi
A silly question that I should know the answer to - I am thinking of putting in an offer on a house.
I will offer x which is about 25K lowering than the valuation on the home report.
I have a deposit that will be 20% of x (purchase price)but considerably less than 20% of the actual valuation.
What is the LTV calculated on?

I have read your post 3 times and the only bit I understand is the final sentence! Loan to value is based on the purchase price - so once you have done your negotiating with the vendor, it is the price that you have agreed. Therefore if the house is offered for sale at £220,000, but you agree to buy it for £200,000, then the 20% deposit would be £40,000. HTH

Thanks -sorry my question was garbled! But you have answered it thanks!