She was also a member of some far-right political groups in the United Kingdom and was imprisoned for violating the Official Secrets Act 1911 during the Second World War.
[12][13] In January 1940, Riddell, Wolkoff, Kent and Don Francesco Maringliano Duco Del Monte, an Italian assistant military attaché in London, met at the restaurant L'Escargot in Soho.
[2] Riddell was interviewed at Scotland Yard, and her unco-operative responses convinced the officer questioning her that she knew more than she was saying, and that immediate detention was warranted.
[2] In 1940, Riddell was convicted of offences under the Official Secrets Act 1911, then detained under the expanded Defence Regulation 18B (DR 18B) and interned in Holloway prison.
[3] She later moved to Málaga, Spain, where she ran a club called La Rascasse ("The Scorpion Fish"), a reference to the tight final corner of the Grand Prix course at Monaco, and the bar located inside its radius.
Riddell drove K3008 in the 1934 Rallye Paris - Saint-Raphaël Féminin, where she finished first in class and second overall, and also posted the fastest time of the day on the Pougues Les Eaux hill climb stage.
[25] At the 1937 24 Hours of Le Mans, an MG PB owned by George Eyston was co-driven to a 16th place finish by Dorothy Stanley-Turner and a driver listed as Joan Riddell.
[29]: 88 Another source of biographical information for the 1937 race records a full name of Joan Hardwick Riddell, born in Wales on 16 April 1912, died July 1997 in Surrey.
[30] A summary written shortly after the event lists Enid Riddell as Dorothy Turner's partner in an MG in the 751-1100 cc class.