I've just spent 6 hours trawling forums and testing some simple (huh!) code that will allow me to open a URL link and include a parameter of a populated field in Outlook

My page will open as expected, but the parameter gets populated into the field as simple text!!

http://lewisville.uk/payment?referen...erties(subject)) is one example.
http://lewisville.uk/payment?referen...erties(subject) is another example.

Please help, I'm going nuts.