Hi I agree with Derek here, If it's a regular customer we don't charge . I look at it as cheap advertising what's a 380 or 382 bulb cost 15-20 pence if bought in bulk ? the time it takes to fit is measured in seconds normally it'd cost more in labour/paper to do a bill & a little thing like a side light bulb or whatever thrown in goes a long way to make a happy customer. We don't advertise but are always booking 3-4 weeks ahead so must be doing something right

Not sure what an average customer spends a year but must in the region of 3-400 pounds so a 15p bulb is a good loss leader in my book.

Matt