and here is when I load the actual website page - all help appreciated.....
This is looking like something is changing the resources, could be BT web protect.
Once way to test is go to the direct url that is showing as up in the console as a warning (amber) due to it being an unexpected content type.
If you go to MyBT and select Security as per https://www.bt.com/help/security/set-up-and-use-bt-web-protect#:~:text=You%20can%20turn%20off%20BT,'... You can turn off BT Web Protect
Thank you jac_95 - brilliant. I switched off BT web protect and the form is now working. Many thanks for your help (and your patience with my lack of experience) !!