Being Prepared....
There will surely be scammers out there armed with NFC readers hoping to slurp up all sorts of nice and profitable data from the unwary especially in crowded places like... The Tube, Pubs, Coffee Shops etc.
A nice RFID blocking wallet is my solution to the problem. I have a similar cover for my passport.
Be careful out there. In some resptects the simpler life in the 1980's was better.