1) Some say the exchange rate reflects the relative economic performance of the two countries

2) It's also said that post-Brexit and various political turmoils over the years the British economy has struggled and some say stuffed

Below GBPNZD chart for last 5 years. Last time I was over there was 5 years ago and the rate was in low 50's

About the same today - does that mean that the NZ economy is about as stiffed as the UK economy