Right quick story.

Engine has been sat unrun for about 2-3 months over crimbo. (Engine ran faultless before going away for christmas)

I decided to do a compression test just out of interest.

and found that Number 4 has 7bar of pressure, 5 bar below all the other 3.

I've done a wet compression test, and this didnt change the result so i think thats rules out a stuck piston ring.

After speak to diva, he said he has had it before where a tappet has become solid and doesnt allow the valve to shut properly. COuld this be the case. I've tried putting a feeling gauge under the cam/tappet area and alot of them i cant feed the gauge in (all 4 on the number 4) some i can move up and down slightly with my fingers but other i cant. (obviously i move the cams/belt round so the lobes are at dwell.

Could this have bent or chipped my valve?

Any other test to do or suggestions before i take the head off