95 Fiesta - Ignition Problem

[alex2k2000]

So, this is the problem:

Barrel wore down to the point that I could no longer turn my key in it, including the master.

Instead of paying the 80 quid that ford wanted to rebuild the barrel and also the trouble of having my car towed to them for them to do this, I went to a scrap yard and purchased a 'new' barrel and key, and also got the PATS reciever.

I swapped out the old barrel and PATS reciever for the 'new' ones and went to start the car, but the dashboard light (under the clock - for the immobilsor I assume) keeps flashing and the car won't start.

I know that the 'new' key/barrel/PATS is correct because the guy accidentally turned the scrap car over in trying to remove the ignition console.

Any ideas would be helpful, as I am meant to be moving house in a week. I would have taken it to the garage and taken the 150 quid total bill, but they are full.

Thanks

Alex