Sowerbutt's Jackpot

Sowerbutt roared with laughter as he and Tipper walked along Savoy Row. “I didn’t realise you found the briefcase, my friend,” he said.

“Wasn’t much in it, guv. Some official-looking papers in Spanish, a couple of scented handwritten letters and £200 in fivers which are in my pocket. And the bag.”

Sowerbutt peered into the small bag and put it into his jacket. “So that’s his game - smuggling in industrial diamonds. Probably flown in from Brazil on the Ala Littoria flights. These will be worth a few bob, Tipper. I know a couple of factories that could put them to good use.”
“A worthwhile visit, guv?”
“You’d say so, old friend. Cash, some vital information for Brendan Bracken and a small fortune in diamonds. We’ve hit the jackpot.”

https://www.amazon.com.au/Colour-Red-Deal-Sowerbutt-Novels-ebook/dp/B00RL9FGKM