I heard from someone recently of the broken non aggression pact that Britain had with Germany before World War Two. The only thing I can find on the internet is this missing wikipedia page from this list.I would have assumed this would be huge news which give me my doubts about its validity. I want to know if this is true and if there are any valid sources of this.
Germany and Britain did not have any specific non-aggression with each other like the Molotov-Ribbentrop pact or the 1934 German-Polish pact. However they were party to various multilateral treaties that did technically serve a similar purpose but there was never an explicit declaration of non-aggression.
Prior to the rise of Hitler in 1933, the Wiemar Republic (Germany) was still a member of the league of Nations and thus party to its treaties such as the 1925 Locarno Treaty and the 1928 Kellogg-Briand Pact. The Locarno Treaty created the Rhineland Pact where Germany, Belgium and France agreed not to attack each other and if any of them did the other two were to mutually defend each other. The treaty also stated that Germany would not go to war with any other country which included the other signatories of the pact, the UK and Italy. The later Kellogg-Briand Pact was the renunciation of war as a tool to settle international disputes which was signed by both the Wiemar Republic and the UK. However most of this was effectively voided when Hitler pulled Germany out of the League of Nations after he took power in 1933 and the following 1934 Four-Power Pact failed to effectively renew any of these treaties with Germany.
The 1938 Munich Agreement and Anglo-German Declaration reaffirmed the commitment for peace between between the two nations at least nominally. What you stumbled across on Wikipedia to my knowledge is someone who misconstrued the Anglo-German Declaration following the Munich Agreement to be a non-aggression pact. While this did state that:
We regard that the agreement signed last night and the Anglo-German Naval Agreement as symbolic of the desire of our two peoples never to go to war with one another again.
We are resolved that the method of consultation shall be the method adopted to deal with any other questions that may concern our two countries
it is by no means any kind of formal treaty or declaration as you can see by the wording and the type of document presented (i.e. lacking clauses). The agreement referred to in this document is also the Munich Agreement thus making this the only other signed document on 30th September 1938 with regards to Anglo-German relations.
Of course Hitler violated the spirit of this agreement and thus it can be seen as a broken "non-aggression pact" but it is not a legally binding document. In addition, Hitler blatantly violated the Treaty of Versailles through his re-militarization of the Rhineland, Union with Austria and starting secret rearmament. The disregard of the spirit of this declaration does not really have a great impact on the debate as its a minor point relative to the violation of a legal agreement which in the end all contribute evidence to the same overall point that Hitler could not be trusted and that his actions were illegal under treaty law.