Could anyone recommend a firm who fit rear sensors please,

Do you have them already?
Im sure you can buy Bluetooth sensors now.

Sensor will still need wiring in for power even if its bluetooth.

no i dont, i want a company to supply and fit, its a brand new car and i would like it done properly with a guarantee,

I bought some once and fitted them myself. Quite easy to do. Think I paid about 20 quid on ebay