Under stairs bike storage

Can you post a picture of the space?

You could take the jackets out and put two hook on the wall to hang the bikes vertically

Yeah you could probably get one to the right of the boiler and then one perpendicular to it on the wall to the left of the boiler (hard to tell how much space you have there), not sure if you’d squeeze two side by side vertically

You can either go with the bike specific ones, or else just standard storage hooks for a couple quid like these https://www.screwfix.ie/p/smith-locke-heavy-duty-screw-in-anti-slip-round-storage-hook-black-103mm/5525j

You should be able to get two bikes in side by side if you top and tail them

Can't see the two bike fitting in like that in that space. You start running out of room really quickly once you go up at all.

before you start putting hooks up, stand a bike up under stairs to see what it looks like, is the saddle sticking too far out for the corridor etc?

I have to those Clug racks like Breezy linked above in the garage for 3 bikes and they ended up talking up too much room, that i stopped using them.

I was more thinking stick them under the boiler and just plug the back wheel into them.

Similar position to the photo but tidy.