This fiberglass hardtop appeared on eBay in the UK in November 2006. The manufacturer is presumably Universal Laminations, but definitely not original factory issue as was advertised.

Notice the sweeping drip rail on the sides and the low squared off top of the rear window. There is a dome light inside, but no indication if it was original or added, and no clue where it might pick up an electrical connection. Best information is that this is a model produced by Universal Laminations prior to the company being commissioned by MG to produce the 1600 factory style hardtop. That would make this a rare aftermarket accessory which would be period correct for the 1500 model. A very interesting part.