Looks like that cylinder has had a loose spark plug in at some point, judging by the debris on the thread.

What do the other two look like?

5 minutes ago, yaz0811 said:

So I've replaced the spark plugs with new ones, just took this one out of cylinder 3, is that how they are supposed to be?  After 1 day? 

 

No, that's running really rich, if the other two look the same then replace the ECT sensor and if that doesn't help replace the precat lambda probe.

Could it be a faulty TB? 

All three are similar 

Possible but very rare thing to have trouble with.

Can you do a compression test? 

 

Any idea what sensor is this? 

 

Oil pressure switch.

If I disconnected that shouldn't the oil light come on the dash? 

Only if the engine is run at >1500rpm for a while. (Possibly with bonnet closed too).

Edited 11 September, 20205 yr by Wino

Thanks, I don't that's the issue, is the ect sensor in the thermostat? 

Yep, sticks out towards battery.

6 hours ago, yaz0811 said:

So I've replaced the spark plugs with new ones, just took this one out of cylinder 3, is that how they are supposed to be?  After 1 day? 

Could be timing related as my mum had the 1.2 htp and the timing chain jumped a tooth twice on two separate chains eventually killing the engine