Seatbelt bracket?

Afternoon folks, i have just dug my 90 out from its winter slumber in the barn and taken it for MOT, breezed it! However i got two advisories relating to slight wear on my driver and passenger seatbelts (where the belt has trapped in the door) the MOT tester recons there should be a plate to prevent the belt becoming stuck between the striker and the door lock, is this correct?? If so does anyone have any pics? Thanks

If you find something let us know. Mine does that and it's getting frayed. When I was young seat belt fabric was pretty much indestructible, but it's a little tender nowadays by the looks of things.

Check this out:
X-eng High Performance Off-Road Engineering

Works on trousers. I wonder if it works on seat belts? Maybe I should get some to help preserve my new seat belts when they arrive.