Ok I have it sussed now thanks to your help. It would have been better if the Custom Form styles were called Templates for consistency, then I would have found ...
Also I can't seem to 'save' my templates, every time I go to the Customise section, I get a new template and not the one I edited. Where are my saved templates ...
Thanks for that, my other issue is the invoice templates - My Company has a VAT number that I cannot remove and the invoice sub total has Total VAT that I can't...