Well, if UK would decide to move to metrics, that would boost the economy.

Most of the UK systems are metric. We got to keep miles and Pints for the tourist industry.

That's what a weak pound is great for. We can become a cheap tourist destination. We're famous for our long sunny summers, world renown cuisine and.... bollocks. We've got castles. OK not as many as people believe and most are barely recognisable as a castle. The Queen. Lets clone her and set up various "London" theme parks.

We should go back to imperial coinage, that way we'd have no idea what our own currency is worth, let alone how much its worth to anyone else.

Not anymore :). I think the Brexit will actually set it back around 10 years at least...