TD5 Immobiliser

Just got a replacement ECU after the top side switches failed in my old one, but now the old boy wont start, how do I get the immobiliser codes into the ECU, do I need someone with nanocom or hawkeye or can a auto locksmith do it, I tried contacting two auto lock smiths today and I'm still waiting for a call back. I've read some posts on here but they all seem to mention vehicles with central locking, which mine does not have