Let my house with Foxtons for 3 years.  The Terms and Conditions stated that they will pay interest at 4% above HSBC base rate if rent is delayed by more than 10 days.  I got them for interest on one occasion only.  Most of they time, they paid after just 9 days.  I paid 17% commission + VAT (i.e 20%) for a very poor service, including Contract for £320 + VAT (you can get a Law Pack Landlord's contract from WHSmith for £6.99).  Ditched them 3 months ago for Haart who only charged me 7% + VAT and charged me contract for £6.99 only and found me some wonderful tenants.