just done a dry compression test, removed fuel pump fuse as well, from left to right in psi (car is bog standard)-

1. 158
2. 160
3. 160
4. 152

the tip on the spark plug is like chocolate colour and outside ring is black. only thing that concerns me is there is a little oil around the ring on spark plug 1 which reads 158 on the far left side if your standing at the front, now if a piston ring was down wouldnt it read a lot lower reading?