I've restricted my thoughts to wastes of British time and money, and these are just the first two I could think of...
£11billion - Smart Meters - on R4 earlier - will take at least 5 years longer than predicted to fit. Will only save, at most, (if anything), half of what they cost consumers to install and don't work now and may never work when people change suppliers.
£11 billion pound waste of human time and money that could be better invested elsewhere.
£50billion ++ Brexit
The way things are neither leavers or remainers will end up happy with the 'deal' so instead of at least 52% population being happy, the outcome will be that the winning 52% will be unhappy as will the losing 48%.
So Brexit as it stands, makes everybody unhappy.
Fair enough, you can't make all of the people happy all of the time, but is making all of the people unhappy all of the time the best alternative?
Surely not?
Why not stay in, save £50bn ++ and settle for 48% of the people being happy?
What other 'grand projects' is the British population currently engaged in that you feel history will judge to have been a waste of time and money?