These are ugly, take up space and a trip hazard. These can be easily pulled out (I just did with my hands) and below them there are pipes going towards the house. All other houses in the neighbourhood have these as well, but some of these been replaced by a flatter version - i.e. grills that take a lot less space and can be driven over. I'd like to do the same, so I can walk there or park my car over them.
Now the question - what are these called? So I can search for them online or explain in a shop without going into a lengthy tirade.
Also, could there be any problems with replacing these with just grill-covers? As I understand, these are for pressure relieve and there should be no problems.
Location is North East of Scotland if that matters.