Well got seat back from Tony Archer and well chuffed with it he re shaped & covered the seat and also added a gel pad, way better than standard BMW seat and also a lot cheaper than all the other options, £120 including deliver plus I was £22 to send seat next day parcel force, could have sent cheaper but wanted him to get seat ASAP so he could get to work on it ASAP.
Posted it Thursday he got it Friday and I had seat back by the following Friday.
Below are the pictures as promised, used mobile so picture quality might not be 100%