Rolled-up interest vs retained (discounted) interest: what a £100,000, six-month loan really costs

https://www.scribd.com/document/997579578/How-a-2m-Property-Investor-Found-That-Best-Rate-Hid-Compounding-Arrangement-Fees-175535

You’re offered a six-month facility tied to a £100,000 face value and told the interest is £10,000. Sounds straightforward