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Leave it! You have been blessed. We are lucky enough to have house martens under our eaves and the noise in summer is lovely - a constant burbling. Our neighbours had swifts in an old marten nest, so we put up a swift box in hopes they would move into that - but the swift box has been stolen by sparrows, so will have to put up another.
4cm is a small hole - possibly too small for a swift, as they are pretty big birds, really. Also a bit early for swifts (usually late April-May, although stranger things have happened), but I saw a marten just last week. Any chance it's a house marten?
A swift nest is not necessarily large, as they are very able to make do (see comment about house marten nest). A small cavity would be sufficient. They'll be gone by September, they won't do any damage (they poo outside the nest - worst case you'll have a lot of poo directly beneath the entrance to the nest) and if you're lucky you'll be able to see the chicks fledge.
Enjoy!!
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Marron
I was sat in the garden this week, during a rare spell of sunshine, and what looked like a swift zoomed straight towards the house, tucked his wings in and slotted straight through a previously unseen hole in a brick towards the top of the wall. From what I can see the hole is about 4cm round, in the middle of the brick, just level with the top of the upper floor windows. What do I do?! It's obviously a nest, so I don't want to just plug it up with something. And even if I could, that feels like a bodge. I don't understand how the hole formed or how it's big enough inside for a nest.