I'm thinking that, if Lettice Curtis had owned a Morgan, it would certainly have been supercharged.
Speaking of Merlin engines and women in the world of aviation, Beatrice Shilling would also have to have been one of the shining lights in this field. If anyone is not familiar with her, check out "Miss Shillings Orifice".
There is a little company in Salisbury, Burlen Fuel Systems.
Burlen They own all rights to SU Carburetors (and most others) and make a good living restoring them and building new.
In the "shop" is a RR Merlin SU, a massive thing it is too. But talking to the former owner, John Burnett, he told me about the "Tilly Shilling".
Interestingly Burlen, then Burlen Services, were once Morgan dealers: you can see a painting of their showroom on the website. It is a funny old world.