Those are forks from a mass-produced Norman Invader. The ribbing was a Norman patent. The fork crown is standard Invader style also found with the normal fork blades.
Could it be 58020 not 53020? Would make more sense. Hard to see from the photos. Hobbs were selling frames through their Manor Park shop in the late 50s and early 60s badged up as theirs with similar frame number style but under B/B, despite what you read elsewhere about them finishing circa...
picture of shop here
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Negative No: 1972-2738 - Negatives Book Entry: Traction Pole Princess Road, Damaged traction pole (No 7)
looks like a Manchester 061 telephone number on the BB of the blue frame above! Definitely a mid 80s frame. So probably too...
Picture of the shop here
probably demolished. Rochdale Road/Blackley M9 area.
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Negative No: 1972-1390.1 - Negatives Book Entry: Cockcroft Street CPO