All sva's cars are expensive, they are 20 mins from where I live, had a nice steak meal by there actually saturday lol. Check the glanzas they sell 4800-5k area (standard or close to)
Possibly not anything to do with yours but thought I'd show you just incase. http://www.ebay.co.uk/itm/JDM-15-Toyota-Alloys-MR2-Yaris-Glanza-GT-Turbo-Enkei-Rota-Rays-Proxes-Tyre-/271280131369?pt=UK_CarParts_Acc_Wheels_tyres_Rims_Car_Wheels_ET&hash=item3f298e4d29
Management best however if they are well set up rrfpr and fcd's can run your car safely for years as has been proven by some, it's down to luck of the draw and the skill of the person who sets your fuelling