Ok, the official verdict, i can put together a kit that consists off :
Replacement PDC control unit
Additional dashboard 'P' button
Four part replacement front grille/foglight inserts with holes for sensors
Four OPC sensors
Additional internal beeper/sounder (may not be required but looks like there should be two one for front/one for rear TBC)
Wiring loom to connect all this
Looking around £480 delivered
Control unit is accessible on drivers side under dash and straight swap old for new, grille/fog inserts are straight swap but reckon they will require bumper removal to run wiring in an OE position, seems a relatively straight forward job but will require coding on completion, just waiting for comfirmation on replacement PDC module as there are two that accept the additional sensors and im not sure on the difference between them, think one is for early models (like mine) and one for newer models (like yours)