I checked the oil tank and everything seemed exactly how it should be, so it was sent off to Westfield for examination. I'm not sure what they replaced or did, but they have assured me it will not leak this time. I reinstalled the tank, replaced the oil and let the car warm up.

Before doing this I had thoroughly cleaned the area beneath the leak so any new oil would be very easy to spot.

The car warmed up and no oil leak. The leak was only very slight so it would not be a big issue if it happened on the way to the SVA which would be the next time we will drive the car.