Defenders' blood, sweat and years
    Were paid to keep a good home-way -
A way yet to be part stealth-blown,
    As mass immigration gained-sway

WWII wasn't fought to defend British (let alone English) culture. In fact, actual folk traditions suffered badly from the disruption of war, and might have been maintained better if we'd made peace with Germany. (There certainly wouldn't have been any American influence on British culture, and none of those multiculturalismsesss.) On the other hand, nobody's shown me that mass immigration has done anything to English culture other than enrich it.

So the reality is more like this:

Defenders' blood, sweat and years
    Were paid to defeat Fascism, albeit at some cost to English traditional culture
Which, fortunately, lots more people are now interested in
    With the additional benefit that it's subsequently been enriched by the effects of mass immigration.