This thread has just made me think. I dont have any particular driving shoes, but I've just realised that I have some Geox black leather trainers that are smart enough to wear with a suit (I use them for lunchtime walks to avoid wearing out my leather-soled shoes). They are narrow enough that they may be quite useful in the Morgan. I will have to try them.
Edit: these are the ones:
https://www.johnlewis.com/geox-symbol-city-leather-trainers-black/p3296461Plenty of grip on the sole. I wonder if you can get them in brown...
