Thanks Pugdog.

I did find the ENV flag last night and had a play around with it - but I couldn't get it to feed into the page for some reason. I wrote a global that returned all the available environmental variables and there is nothing suitable there and after adding the E flag the extra variable didn't appear. I'm not sure whether that is because of other flags I'm using or mod_proxy etc - I'll try some more experiments with this and see whether I can get it to feed into any pages.

Thanks for taking the time to think about this, I appreciate it.

Laura.
The UK High Street