Thanks to all for your replies.
After thinking about it more, a separate welly and riding boot will be more practical, I can hopefully leave the riding boot at the yard.
I have narrow feet and slim calves. I will look at the suggestions here, but any others are welcomed too.
Anyone have these?
https://www.ruddswellies.co.uk/product/riding-rudds/#buy
I only ride around once a month - just hacking out a friends horse, I need new riding boots and new wellies for walking the dog and thought these might do both jobs.
I know youre not supposed to ride in wellies...