firstly, I am going to assume that when you write "discs and drums" you actually meant "discs and pads".
So we have here a set of discs and pads that have covered c40k over 4 years. About 10k pa, so I'm also assuming the car is being used pretty much daily.
I would say that 40k/4yrs is a good life for the pads. You obviously know that they need replacing or you wouldn't have gone to KF in the first place.
However, in my opinion (bearing n mind that we cannot see your discs from here), I would suggest it is unlikely that your discs need replacing as well. Discs do wear as well as pads, but you should be able to get 2 or 3 sets of pads per set of discs.
There are factors that could lead to the need for disc replacement at this low mileage. Leaving the car stood outside for days on end when the discs can get badly rusted is one. Using the car daily scrubs off light overnight rust easily stopping the corrosion eating into the discs too quickly. Also if there is excessive scoring due to dirt or any cracking then the discs will need replacing.
What you should ask:
Ask what is the new disc thickness for your model? Ask what is the minimum specified disc thickness for your model?
The difference between these two figures tells you the maximum permitted wear. About 3mm (1.5mm per face) would be typical
Ask, what is the actual thickness of the discs on your car? This requires the mechanic to actually get some tools out!!
The difference between this figure and the new thickness will tell you the actual wear on your discs. If it is half the permitted maximum or less, then you can safely put a new set of pads in (unless there are other reasons for changing them as above).
This should help you question any advice you are given. I would echo the advice given above: find a small local independant garage. Use recommendation from friends/colleagues/neighbours.
Why not let us know what area you live in, someone here may be able to recommend a garage. Or use the HJ Good Garage guide (see links at the top of the page).
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