A Spanish phrase book in my late father's possessions has his address as 810 Squadron, HMS Furious, c/o GPO, London. His form 543 has him at 5FTS Sealand from October 32 till May 34 with no mention of 810 Squadron which was formed in April 1933.
The problem is that 810 Squadron does not appear to have been on HMS Furious, but rather on HMS Courageous according to Sturtivant.
Other addresses in the phrase book are consistent with the form 543.
Any thoughts on this anomaly?