I wrote to them . . . here's their response . . . very useful information indeed ;-)
"Thank you for your email.
Please accept my apologies but we are unable to give customers information regarding the manufacturers of our products for confidential reasons. However I can inform you that all of our shoes are supplied from a Northamptonshire manufacturer that we have been using for many years now.
If I can be of any further assistance please do not hesitate to...