right then , im struggling on this one , did my oftec exams a few months ago , and now im registering with them , I do a lot of my own work after working for the company I do in the day, im already gas safe , and charge £60 for servicing a combi , I provide a cp12 with every service as advised to do by the gas safe inspector to cover my .... im happy at this price, takes me 70 mins max maybe , and that's being keen , tightness test and cert (smoke break in middle) , did my first proper oil one the other night, ok I might be slow to start off with but I was there for over 2 hours , and I was stinking of oil after!!!! charged 70 , and had to pay for nozzle , filter , and flexie, I was worse off than doing the gas! I charge £35 plus parts for a standard plumbing call . am I about right?