Wasn't that 'Higham's'?
I lived in Nottm from '63 to '99....in the last few years before I moved on, my neighbour was an amazing man ( then in his '90's) called Harold, who told me he had worked at Highams ( I'm sure that's what it was called) most of his working life, from his apprenticeship onwards. He mentioned the caves being used as air-raid shelters ....and being full of years worth of accumulated rubbish !
This is the first time I've visited this site - thanks for some stunning photos.