Rear discs and pads replaced today by Automotive Engineer Excellent excellent. Old bits now in boot to continue pursuit via Toyota head office, then trading standards.Have a look at
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Threaten them with a report from one of the above suggesting that if anything untoward is found, the garage will rectify it and pay the cost of the inspection.
Failing that, see if you can get it into a council run MOT centre MOT and vehicle care services for them to check it out.
Sod the rest of the Warranty period (18months to run). Engineer Excellent will be looking after the car from now on.