If you have ever booked a flat clean in Earls Court and watched the day unravel because of a missing key, a stubborn buzzer, or a landlord who suddenly "can't remember" the porter's hours, you are not alone.

If you are trying to weigh up carpet cleaning prices in Kensington comparison cheap versus pro, you are probably doing what most people do: trying to make sense of a quote that looks fine at first glance, then wondering what actually sits behind the number.