The documents folder on the server would need to be shared and that volume would need to be mounted on your client machine. I believe I've seen reference to appliescripts that can mount volumes.
How you mount the shared volume then determines the file path you'll need to use to save to that location.
The pdf file is automatically named after the Enquiry name and order number - e.g. Smith/1000.pdf
Hmmm, to me, that looks like you are naming the file after just the order number and putting it inside a folder named after the enquiry name.
Thank you for the advice - I am half way thougth cracking it on a local machine - using dropbox as a contingency folder! If I cwn get this to work, I shall attempt the server version...
If it works I shall post the script here so anyone else can see how it is done as it has taken quite a while! (Nearly there hopefully)