AIUI the MoT is a functional check of the brakes. If they provide the required retardation etc the car passes. I suppose there might be an advisory of there was very little pad left or the discs were visibly badly lipped.
I'd imagine 80% worn related to the pads and is an estimate based on what is visible. So far as the discs are concerned he could ask what the min thickness is and ask if the measured it and with what result.
Modern pads are harder than used to be to be and discs are consumables like tyres and pads. In my experience discs need replacing at alternate pad changes - the lipping shows the system works!!
I had a similar alert and silly price quote for my Fabia at the last service. Still OK now but I'm monitoring the discs as I'm not sure they'll go all the way until the pads are done. Much cheaper at my local fast fit outfit - Formulae One in Northampton - than at the Skoda dealer.
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