Well said aP (above).
Firstly I would ask if your architects really are Architects. Many people call anyone who does drawings architects. You need to be registered with the ARB to call yourself an Architect. Architects don’t do structural calculations anymore as they are not insured to do so.
Siloseven makes a good point too.
As for £250 to do some drawings, that’s fine. If you want to pay about the cost of a decent seat post for something like that then you are right, a technician will do. Thats not knocking Technicians, many are excellent and have a good knowledge of regulations. Do you prefer to see the practice nurse or the doctor? The legal clerk or solicitor?
Obviously I’m an Architect so will protect my profession. You should have an appointment document that is clear on what will be produced and how much the fee will be. I agree with aP’s final paragraph. Best to talk it through. Your appointment should also have a complaints procedure if you are not happy.