Unable to answer "Is there an air compressor available here?" – Birmingham Garage (Gas Station) – https://osm.org/node/455887749 via StreetComplete 58.0:

The garage looks like it's closed down long ago, but I can see things in the floor that could have been the site of petrol pumps. There's a sign in the window saying that the bike hire has closed down. No better photo as I didn't want to get in the way of the person with the car

Attached photo(s):
https://westnordost.de/p/237696.jpg