It was starting but then ran slightly **** so I changed the dizzy cap and rotor. plugged it all back together and now it wont start. almost like the ignition coil isn't firing.

Also there is some kind of coil behind the rotor arm, which just looks like copper thats been wound up, one the wires on this coil going to a contact and looks a bit iffy - what is this coil?

I had the original key taped to the imobiliser sensor (key was broken) so I could use more than one key but didn't cause me any problems before.