I recently had a trusted washing machine specialist visit to fix my machine . He charged £50 for 15 minutes of work (his rate is £50 per hour and that includes call out charge) and mentioned that a certain part might also need replacing if the fix did not work. However, the machine is still making a horrid noise, so I'll need him back and most likely to replace that part.
My concern is whether I will need to pay another £50, given that he was just here and didn't fully resolve the issue. If he does charge again, should I accept it, or is it reasonable to question it? I don't want to lose a good and reliable tradesman, but I also want to be fair. What would you do?