Lift the rocker box off, remove the two plastic bolt covers and two 10 mm bolts should be exposed, See if you can find any leaking oil into the spark plug bores. off topic, Manjinder- Cool car!
Seen worse result,not too sure why it wouldnt fire tbh.just because two were down on compression the other four would still fire....be it a tad rough! 2nd hand units are about 400-500 quid.