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branwen
NotThamesWater
Has the outside ground level has been built up over time? If it has, I would guess that the council has a responsibility to do something about it.
I reckon your choices are
1) lower the ground level to an appropriate height,2) build a levee, much like you would around a ground water drain / downpipe drain, or
3) brick up the airbrick, and install a periscope air brick*
* In what way is the brick is not easy to chip away - too soft / hard / crumbly? Is it a solid or cavity wall (whether it is stretcher- or cross-bonded should give a good indication, particularly if you know the age of the property).
[Edit] 1) is supposed to be striked through, but apparently that's not a thing any more