Oil Spray Under Engine Lid

[Whisperhead]

Hello all,

Back again - outside changing gearbox oil today, and noticed a spray of oil on the underside of my engine lid (picture below).

It seems to be coming from the gap shown in the second image (gearbox?) but I can't be sure (third image a close-up but is sideways due to angle).

Anyone come across this before?

[Carolyn]

Is your oil filleer cap done up tight?

[Whisperhead]

It is as far as I can tell - I'll give it another spin to be sure. Will update. Thank you Carolyn