Bridging loan costs in the UK usually add up to around 7% to 15% of the amount...

https://www.emergbook.win/bridging-loans-in-the-uk-typically-cost-between-7-and-15-overall-monthly

Bridging loan costs in the UK usually add up to around 7% to 15% of the amount borrowed. Monthly interest rates tend to range between 0.55% and 1.25%