I think I'm getting a little worked up now - a few details here and there are falling through the cracks.
I had collected all my work ex letters last year for the FSW, as a result the letters are addressed as follows
The CIC,
Federal Skilled Worker Program,
Centralized Intake Office,
PO Box 7500, Sydney NS
B1P 0A9
Canada
Can I send these letters for the EE (assuming I get the ITA)? Or do I have to start getting letters all over again from scratch addressed specifically to the CIC Express Entry? Is it grounds for stopping / slowing application? The issue is that I've got a lot of contractual work so I have had to get 8 separate work ex letters tailored to the relevant NOC for FSW, unlikely these organisations will now repeat the favour.