Ronald you (and they) should know better then; I think you need help to understand that the activity of a few, did not mean there were thousands who supported Hitler in England. There were very few succesfull saboteurs and fifth columnists in the UK during the war.
We caught most spies and either turned them into double agents, or eliminated them very quickly with few exceptions. One of the biggest problems we had was the Communist agitators in our trade unions who caused no end of trouble to the war effort; but the hearts of the working people were not always fooled by them; and we all know what happened to Herr Hitler.

For the most part, we had a lot of people from other nations (Holland, Poland, France, Belgium and Norway in particular) who worked very closely with our secret service to make sure we were succesfull. Ask your relatives about the Polish submarines Sokol,Wilk, Orzel, Dzik, The Dutch submarines O-16 O-19 O-21. If they dont know, then get reading.

My father was in the Navy on HMS Penelope and HMS Montclair. Trained as a SBA and CPO Diver/Articifer. He served in Europe, the Meditereanean, Australia and was in Hong Kong for the surrender of the Japanese. My mother was a Wren in Porstmouth and one of her sisters a WAC(involved in top secret signals) Two of my uncles served in the RN, one in the Army, and my Grand Uncle was a distinguished naval officer both at sea and ashore in both world wars. My grandfather served in the army during WW1, and police force in WW2. Another relative by marriage worked for British Security Coordination; that is William Stephenson (aka Intrepid) Some of the people I worked with as a young man were quite senior officers in the Royal Navy; who became Merchant Ship captains after the war. They all told a very different story to the one you are spinning mate.

Yours, Aye. Dave