He celebrated the catch with a beer and steak dinner afterwards.
Mr Ludbrook was fishing at the Holme Fen Fishery in Colne, Cambs, when the monster from the deep went for his special bait mix which included white chocolate and krill.
Mr Ludbrook said: “When it first took my bait I could tell it was a good fish but I had no idea it would be the size it was.
“When it first came out of the water I was shocked, stunned, and to be honest, shaking like a leaf.
“My previous best carp was 35lb – I’d never even seen a fish that size before.