If you own a £250,000 house and you have a 61% LTV then your outstanding mortgage is £152,000. If you want to have a 60% LTV then you need to pay £2,500 so that your outstanding mortgage is £150,000. £250,000 x 1% = £2,500.
If you own a £250,000 house and you chuck £800 at the outstanding loan amount (and you’re precious LTV was 61% on the nose) then you’re moving yourself from an outstanding loan of £152,500 to £153,300. Which moves you from 61% to 61.3%.
If you paid £800 to move yourself from 61% to 60% LTV then your house must be worth £80,000.
If you want to pay to move yourself into the next bracket, just check your maths.
Those posters weren’t being cunts; by mumsnet standards they were being trollhunters because there were queries over the truth of your posts.