Camden Box Frame charge by the half day / full day, and not by the hour - so if your job is minor, you should consider using someone else. I was recently charged £318 for a job that took less than an hour, as they applied the daily rate. Upon dispute, they reluctantly refunded me £80+VAT.
Despite my being a loyal customer for a number of years, I was disappointed by their handling of my objection and I won't be using - nor recommending them - moving forward.
Camden Box Frame Co are manufacturers and retailers of doors and windows.