Used Paisley Freight a few times, last time a couple of weeks ago shipping a mk5 bumper and never had a problem, on time with tracking provided.
They are relatively cheap as their insurance is based on only being £5 per kilo for "popular services" items, If you want extra insurance to cover the actual cost then it mounts up. If your wheels/tyres are £500 then add £20, if £750 then add £25 etc etc etc