I will PM you re Aeromax.
Didn't you read his comments on the Lister post... he has no more space!
...then again, he could store his RS in my garage.
...or 'his' AeroMax
Now, back on topic.
The S1 and S4 are quite different cars - the S1 being the more basic, pure and stripped back of the two; the S4 being the more comfortable, larger (read better for taller than average drivers) and more practical.
To my mind, comparing the two is a little like trying to discuss a preference between apples and oranges – Morgan really have developed the Aero 8 and it shows (just like Porsche have developed the 911 over the years) but the merits of this will always divide purist opinion.
That said, and what I find most interesting is, I believe both cars are still excellent value – you would be hard pressed to find a car with more personality for the price of an S1 and show me another car that is hand built that you can buy for £68k, new, like you can the S4?
