Using the DVLA MOT check it looks like the car needed:
* Front and rear discs (you'd also change pads at the same time)
* Lower suspension arm bushing
* Rear coil spring (usually changed in pairs, but not essential)
* Seatbelt mechanism
Looking at euro car parts for prices, the brakes would be £270 all in. Lower suspension arm bushing would be £75 to replace the whole lower arm (less labour). Rear coil would be £50. And Seatbelt mechanism another £20.
So that's £415 in parts. Then your likely looking at 4 hours labour on top. I'm not sure on labour prices in Cardiff, but where I am in the southeast you're looking at least £60 p/h.
So easily £600-£650 for parts and labour I'd imagine.
Sources:
MOT history
Parts prices
Labour prices