Thank you for contacting the Commando Veterans Association. As we are an an association, we do not have access to official government files and archives so I can't give you a definitive answer.
However, I do know that a number of Spanish Republicans fought on the side of the Allies during the WWII and a number of Special Forces had Spaniards in their numbers.
I have not however, ever heard of the 23rd Spanish Commando!
All these British Special Forces units had Spaniards in the ranks:
50 Middle East Commando; 1941
D Battalion of Layforce; Crete 1942
1 Special Service Regiment
2nd Special Air Service (SAS)
Long Range Desert Group
Between 62 - 65 Spanish Republican members of this 50 ME Commando were amalgamated into D Battalion of Layforce on Crete. Most of D Battalion were captured when the Germans landed but some escaped or went on the run. Of those who escaped some went to 1 Special Service Regiment and from there onto 2nd SAS.
There are three books which may give more detailed information -
"Los Espanoles de Churchill" by Daniel Arasa, which covers most units in the British Army where Spaniards served.
"Tobruk Commando" by G Landsborough
"The Middle East Commandos" by Charles Messenger
That's all the information I have at the moment but I will look to see if I can dig out more (I have a feeling that I have a list of names for the 63 Spaniards in D Battalion somewhere...)
This message was edited 1 time. Last update was at 19/10/2017 15:10:21