Richard, there eveidence tucked away in the London Transport Musuem Archive that a number, around 100 if I remember , X types were available and sent over to France with LGOC drivers in September /October 1914 for use with the Royal Marines expeditionary force to Antwerp on the 3rd October 1914. The subsequent withdrawl led to some vehicles being captured by German forces. Most of the paperwork is various letters cablegrams and odd memos. Seems to have been almost a spur of the moment thing. in the book First Men in Tanks, can't remeber the full title, it mentions a couple having boiler plate fitted. Post some pictures of your beast!