I have since done much more research and have discovered who my 'Petulengro' was.
His name was Harold Moss - I have quite a bit of documentary evidence to confirm this, so thank you all so very much for all your bits of information which have helped steer me in the right direction and led me to meet some lovely people. I can now positively confirm that my Petulengro aka Harold Moss was absolutely not Leon or Xavier. Harol Moss lived and died in Stock, Essex.
Of course - it doesn't end here! I am now on a mission to find all of the band members and their names. I have started a very rudimentary website dedicated to Petulengro and his Lady Hussars - you can see it at
http://www.petulengro.co.uk so if anyone has any
further information on the band members or any of their engagements I would dearly love to hear about them.
Thank you all, once again for your interest and participation.
William