Contact Forms not working

Hi Team

Great theme as always
On a number of my websites, the contact from has stopped sending emails to the noted recipient email
This is happening across a number of the sites i have created, but weirdly not all.
Here is an example, https://heatonwoods.co.uk/, there is a contact from configured on the homepage and the contact us page

If you can help identify why that would be a great help.
There are no other builder plugins. And I have tried when removing all forms for spam protection, and still no joy

What could be the reason?

Many thanks