Very little these days.
I had stirrings of national pride in Britain and achievement when I watched (and heard!!!!) the Eurofighter Typhoon at the Biggin Hill Air Festival, but then I got to wondering how soon it would be before a huge rumpus was kicked up about none of the pilots being muslim or from an ethnic minority, then I got depressed.
Like it or not, Britain has irreversibly changed. For me, there is very little left to be proud of, and much to rue.
My organisation published a load of politically correct educational material wherein it was pointed out that roundabouts (on roads I suppose) were invented by a black man. I thought it rather curious to put that in print. There must have been better inventions from the minorities.