Hi Andy.....hope you are well?
The tapping noise is usually a sign that the oil is not at it's best, and also maybe worth using a flush through the engine when you do an oil change.
A good quality oil and of the correct grade should resolve this issue.
It sounds like it could be a leaking cam cover responsible for the oil leak so I would programme this to be replaced at the same time as the oil change maybe?
Keep us in the loop as to how it all goes.
Cheers, Trevor