Got under it earlyer and have noticed the 2nd 02 sensor is not fitted
this may be the route of it !?! Think if it was the way it is due to mods it would be like it all the time , also seems excessive so can't imagine any tuner would let a car go out like this , and if im honest i dont remember it being like it on the test drive and first day or so of owning it .
I did the oil swap to the recommended nanno drive , changed the plugs earlier and noticed i have oil leak onto one of the spark plug wells from the rocker cover gasket , so these will be my first fixes