Half mile ride to the station with the ergons felt better instantly. More support for my wrists for sure. I did get the fake 6 quid eBay ergons with little bar ends, which I'm not particularly keen on, so will probably get a set without the little nubbins.
Not sure if a solid grip will help but does push your hand in a better angle.
Might fit a flat bar on my M type, as the stem is shorter than the S type.
Plus I have access to all the Brompton parts at work, so it's all good.
My 40t chainring arrived with metal chain guard, hopefully will fit it tomorrow and shorten the chain by 4 link.