So my work-around was much simpler than the complicated way I was trying to do it in the first place. I was originally trying to use a switch statement to get the value (rather than the key) and create a variable to hold a different URL based on each response. This worked fine in the bodycopy pages but could not be used in the ‘Email options’ as the was stripped. This is because there is only the option for a wysiwyg editor
However, I replaced the key in each of the select items with the actual URL and even though I use - it delieves a URL to the image I wanted to select.
I will go back and play with the %_key% option later