Looking at images of stock MG pumps its the same as the ones I got in my Citroen and in my Kia, both would pump up tyres without the goo.
I used it a few times, both to raise low pressure and to inflate punctured tyres with the goo. Very easy to use, it can take a while to inflate as its only got a small piston.
In life, it's not who you know that's important, it's how your wife found out.