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

https://troyaeco194.theglensecret.com/how-a-250-000-loan-turned-into-a-28-000-29-000-bill-practical-steps-to-stop-fees-eating-your-deal

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