I am going to stick my neck out here and say that this is definately a CORNFLOWER. Look up Centaurea cyanus and Centaurea montana. The latter is the PERENNIAL CORNFLOWER It used to be very very common in the UK but was killed off by the intensive farming techniques using fertilisers and weedkillers.
A bit like the poppy. Some waste ground and barren ground still have swathes of both but they are now rather few and far between.