What you have consider is that if you have anything to hide there are many options that allow you to do just that, so gov`s and thier agency's will find it very hard if not impossible to watch what you are doing.
This sort of government activity across the world in general not just in the UK is more about Big Data analysis and controling the masses but that said you also have the problem of abuse of that freely avaible data with in agenys and that needs to be controled and monitored.