someones going to criticize this- it only took 5 seconds to consider. Why not buy some OTM Calls on Financials as a hedge? (I would not put this trade on myself, but if you are already hedging against a global economic correction with a pound short and a gold buy, it might be worthwhile to put this on as a hedge)
If you are assuming that gold is tied to the financial well being of the UK or North America, and you are short the Pound, buying some financials could in theory work at a "macro" level.
you calculate your hedge based on what you estimate the risk is - say you bought gold and could lose max $100 on the price of gold, figure out what a $100 fall would cost you. (I don't know you're contract size or tick value)
Then figure out how much an increase in the pound would cost in this setup. And then figure out the "leftover" on the pound-gold trade and buy financial call options to cover the difference.