A good bit
Cockney slang for making cash. Bunce comes from bunsen burner, and that rhymes with earner, so it’s basically a fancy way of saying ‘I make money’ and it’s also kind of stupid.
‘I’ve got a good bit’, he said like he was a money-making wizard
‘A good bit’, she said like she was in a school lab and not a bank
‘A good bit’, he said like he was trying to impress his grandma