Analysis of information sources in references of the Wikipedia article "Edgar Speyer" in English language version.
Under Speyer's enlightened leadership... and with his private injections of cash, the Queen's Hall Promenade Concerts not only entertained full houses of 'popular' listeners, but acquired international esteem...
The Queen has accepted Jonathan Aitken's resignation from the Privy Council. [...] Two former disgraced ministers, John Profumo and John Stonehouse, have also resigned from the Council, but no one has been thrown off since 1921 when Sir Edgar Speyer was struck off for collaborating with the Germans in the First World War.
Dedication: Meinem Freunde Sir Edgar Speyer
Dedication: Seinem lieben Freunde Edgar Speyer
...because a baronetcy is hereditary there is then little doubt that a baronet cannot resign his title and its privileges...", "None the less it would seem that the office [of Privy Counsellor] cannot be vacated by the holder... as the honour is conferred by the King he alone can take it away.[dead link] (registration required).