Dunno how old you are Fumble but my Grandma's were both adults in the war. One lost her husband as a PoW for 6 years the other was in the Western Desert and Italy - both lost father in WW1 and both hated everything German - my Dad's mum never even distinguished between West and East Germany - they would have resisted.
There was also a secret resistance army ( see below ) and when I lived on the South Coast I recall seeing a documentary where they recruited folk like game keepers and land workers and the like. The minute the "balloon went up" they would walk out of their houses and go to the places in the link below regardless of the fate of their family - they had a couple on and because he had signed the OSA he had never told her the plan was to abandon her and the kids to resist and she dropped the bombshell that she had never told him for the same reason - she had been recruited as a radio operator so she would have been transmitting about enemy movements until she would have been found out and shot.
I think France Belgium and Holland fell too quickly plus there was a lack of leadership from their governments resulting in mass columns of refugee's and fear in the general populace. The fact we had the channel as a barrier meant the Govt could galvanise the public mood and there was a sense of purpose about what could be achieved.
I remember my Grandad telling me that as a Lancashire Fusilier and part of the BEF they marched all the way to the Albert Canal in Belgium which was seen as a barrier to thwart the Germans. Nobody thought to blow bridges and the Germans had boats so they got told to lob Bren Guns, Vickers guns and mortars in the canal and head for Dunkirk! Even then they knew the rate things were happening the channel was their barrier.
Different times different people.
Winston Churchill ordered preparations to be made for a secret resistance force to report on and agitate against any invasion force that might arrive.
historicengland.org.uk
British Auxiliary Units were trained to sabotage the enemy in case of German invasion
www.smithsonianmag.com