Hi 'Pops. No problem with seat belt anchorage points in cars constructed before 01/04/82, they just need to '
hold the seat belts securely in position on the vehicle'.
Interestingly, two point belts are also ok on a '65 to '81 car, but they need to be
diagonal belts, not lap belts. See below.
http://assets.dft.gov.uk/publication...e-vehicles.pdf
I'm aiming to build the female part of the seat belt into the seat mounting frame.