Also got to say when trying to start it up the oil light flashes
That's normal.
Coils are very common to go. In fact mine went a few months ago, replaced it, and it went again yesterday! Bought a brand new genuine VAG one now with a year's warranty so should be good for at least 12 months

I'm not familiar with the 1.8 SE engines, but I'm guessing they're MPI, therefore pretty similar to the 2l 8v GTI engines. If that is the case it should have the ECU relay in the fusebox.
If they could see sparks from the coil that suggests it's had it, they can't be fixed so you have to buy a new/used one (as I experienced though, a £10 used one may only last you a few months).
All coils in the 4 cylinder Mk3 engines are the same, so it doesn't matter if it's aircon or not or 8v/16v. Don't see how you think an electric sunroof will make any difference
