Like all car builders, MG produced proposals for new or replacement models as part of their ongoing effort to stay competitive. In the early '70s, MG explored a number of potential replacements for the Midget. Sadly, none were ever approved for production by whatever corporate overlord there was at the time.
One my favorites was a mid-engine study done under the code ADO21. This razor-nosed coupe would have had a 1500cc, transversely mounted four cylinder E-series engine. Like the production Mini of the time, the car would have had interconnected Hydrolastic suspension.
You can read more about this car that never was at Austin Rover Online.