to envelope or not????
 

Hi
I have got a request for more info from CIC, and just wondered whether I should enclose a stamped addressed envelope?
It only ask for one for return of documents, but as they're photocopies they don't have to come back.
I'm only asking cos they've used my envelope for wp by asking for other info, so do I include one just in case, or might they even run to the cost of one to issue my WP (fingers crossed) after my med?
Jo