Just found the guy that did it on here, his name was mondo300, below is what the costs were:
Seats (orange leather, orange stitching): £650
Doorcards (black leather, orange stitching and insert & armrest orange leather, orange stitching): £275
Vents (black leather, orange stitching): £50
Gearknob (orange leather, orange stitching): £50
Gear gaiter (orange leather, orange stitching): £15
Handbrake handle (orange leather, orange stitching): £20
Orange leather to be used on steering wheel retrim: £10
A total of £1,070 for the above parts.