World War II Today is an interesting site with stories from the war, updated 70 years after the event. The site is currently posting events from 1944 but the site also has articles from previous years. One article entitled the Last Execution in the Tower of London appears for 15 August 1941.
The article is rather brief and makes note of Jakobs' landing near Ramsey, the charge of Treachery and the death warrant sent to the Constable of the Tower of London. While brief, the article is generally accurate.
4/5 - brief but accurate.