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I would probably use Zinsser All Coat. It's supposed to be self priming but you can use Zinsser 123 to prime it as well. 2 coats would probably do it. If you're painting over oil based then you lose the moisture vapour permeable advantage of an acrylic base. It's become a bit of a go to for exterior paint, I've painted quite a bit in my neighbourhood and it's all stood up well. It is quite thin and sticks to anything it falls on, if you're painting on ladders you need some drop cloths.
Nice job on the window. I see the cobra nestling in the back of that photo :)
Airhead-
Cheers @Airhead - v helpful. I've got scaffolding up as we're getting the roof/loft done so I could be a bit more thorough with the stripping back, but there are a few spots at the ridge I can't reach easily. I've used the white satin Allcoat inside and been happy with it, will try to find the gloss black nearby.
The cobra is great, I'm almost looking forward to doing the front bay sashes.
Screwball
Ok then hive mind (calling @Airhead) I'll be stripping and repainting old wooden fascia boards soon and I'm torn between waterbased and oilbased gloss black paint. Is Bedec MSP magic, or is waterbased not as durable? I don't have the access for a full prime and top coat, so it will be a quick strip/sand/slap it on.
In other news I'm chuffed with the tarted up bathroom window.