Hi Brendan,
There's a number of areas that the oil may be coming from, but the easiest to check and most common is the timing chain guide retaining bolt behind the oil filter housing. If you look down between the cylinder head and oil filter housing you will see a black headed bolt (can't remember what size), pop an open ended spanner down there and see if it's loose.
As the engine is leaning over it tracks round the head gasket and drips on the the A/C compressor.
If not might be worth buying some brake cleaner, clean off the whole area then run the engine and see if you can identify the source.
Let me know how you get on.
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