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@TW thanks for the reply.
The outside ground level has been built up over time and the council own the pavement that is now there.
The property is ~1790 so its solid wall and the wall are very very thick so installing another air-brick might be a big task, although possibly the only option.
I'm going to get in touch with the council as other properties on the street have drainage channels to stop water ingress - not sure why our house wasn't done at the same time.
andos-
The property is ~1790 so its solid wall and the wall are very very thick so installing another air-brick might be a big task, although possibly the only option.
It's not that difficult, and the fact that it's old makes the brick removal a lot easier - the mortar and the bricks likely quite soft.
Tapping the council up sounds like the way forward though - you don't want to be messing with your walls because of their cockup.
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