Flying from Hong Kong

I'm having a holiday in the UK in August, and want to know how much money I can put in my suitcase to take home. I'm flying from Hong Kong, but as I live in Guangzhou, I am also taking a short holiday in Zhuhai, Macau and Hong Kong. How much money can I take across the Zhuhai-Macau border, then into Hong Kong, and then out of Hong Kong to UK?