We are a small independant company,trading for 32 years,with many contract customers.I am an ex BG employee{14 years},also I was an employee of Baxi Potterton,Heateam. I see objectives from both sides of the coin.It is easy to pick the usual suspect on a faulty boiler,when time is crucial, and then onto your next job.Whilst employed by major companies,the cost of the part was irrelevant,maybe hit and miss,or following engineer would correct.As a small independant business,when I am am wrong in my diagnosis of a boiler fault, and purchase and fit say an expensive pcb,if the fault persists,the customer does not pay.That really is my my fault,misdiagnosis of the problem,the job still comes back to me.You learn something new everyday,technical helplines,which we have all used in times of duress ,or ,stress are not that good,they almost reply in a mantra ,from a screen.We are only as good as our last job, so really we should not knock an independant .or a BG guy.Remember this is an open forum ,which anyone can view.Also without boiler breakdown,and customers,we are all without work.Apoligies for the long rant.Mike.