Getting Gwen the Mini to Run.

I wouldn't worry too much about the leak, let it develop and enjoy the car
If it gets worse then you'll be able to see where it's coming from, it's not going to do any damage
Head gasket usually leaks from further along near 1 and 2, if it's gasket then just use it till it's fooked and then swap it.

kermit_rr said:

Um have you cleaned it to see if it comes back?
Clean it up.. start engine.. watch for progress

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Several times. But it only appears after a run. I want to believe it's the rocker gasket, but I can't find any oil ABOVE the plug well so far.

i think its the rocker gasket

for the price of a rocker gasket change it and find out

DanClarke said:

It is a HIF44 SU carb.
I am willing to believe it's the HG, but I cannot track the oil down from there so far.
If it was a cracked head etc I would expect other symptoms too. No blue smoke or steam either, but the radiator was a bit low when I checked it yesterday so I suppose it is possible. Hotter plugs @Stanleysteamer I had thought of that its got BPE6's in ATM and I have a new set of BPE5's I can try.

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You could also try weakening the mixture a tad.
Did you pull the plugs after a decent hot run? I seem to remember before, you were happy with the colour of them.
You could always do a compression test, if that cylinder is down on pressure then things need investigating unless you CBA and just want to enjoy it for a bit!

For oil to be coming out of the plug hole there has to be a leak at that point AND there has to be availability of oil to it inside the head.
Does the plug come out or go back in any "different" to the feel of the others? Has it been crossthreaded at any time as far as you can see?
Loadsa threads available on how to fix it if it is bad, i.e. beyond just chasing it back down.

If your oil is very clean then maybe you can only spot the bit that has run down to plughole and got dirty