As mentioned above – long tall sally website would be a good place to start,
but ‘Onlymaker’ may be the best place to look – its not in the UK but makes shoes up to size 15 !!
Maybe worth buying a few as the prices seem reasonable -??
‘ onlymaker.com ‘ … its an American site and looks great, but not seen any of their products in the flesh so to speak ..
Hope that helps
Onlymaker are also available on amazon.co.uk 😉