Why don't you buy some Race harnesses? I got 2 for £90 from CAR who operate in surrey. I think Motorworld offer them at the same sort of prices. 3 point harness, one point on the bolt which holds the seat belt rail to the right of the driver near the sill, one on the left side of the seat in the exact same location that the standard seatbelt socket is positioned. Obviously remove the socket first. Then the third one goes down the back of the rear seat and bolts into the same place the rear seatbelt bolts down. This means you cannot have passengers in the back and am not positive how it stands on MOT as yet but will find out soon.
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