Took the SC in for 4 new tyres in Feb (Lexus Croydon), never got the car over 45mph before March noticed vibration through the steering. Immediately I figured that one of the wheels wasn't balanced or a weight had fallen off. So although I had only 4K miles since last service I booked it in for a 'mini service' in May. By then I noticed that under braking, from speed, I was getting 'judder' back through the steering. Non of this was happening prior to the 4 new tyres. It also started to 'squeal' every time you braked.
I reported all this and took the car in for it's service. They said that a brake caliper was stuck and but they managed to free it and lubricate it, saying it was fine, they then said that a 'plastic wheel spacer' had broken and needed to be replaced (£20.00), then they said that the brake pads had no 'shims' and charged me £68 x2 for them. so my bill for my mini service came to £600.00. I challenged them on how suddenly the car had developed all these faults after they had put 4 new tyres on the car but not a thing was wrong with it before then. Passed MOT in November, no problem, had done only 4k miles or less actually since that MOT.
I have asked Lexus UK to intervene.