My great grandfather was born John Stanley Wood on 22/01/00 in London. Some time before his marriage in 1923 he either changed legally, or was using the name Robert John Stanley Burns. I have no ideal why this happened but I am struggling to find any records about him for the period from 1915 when he was discharged from the army under the name John Wood for being underage to his marriage in 1923 to Lilly Mitchell under the name Robert Burns. Due to his difficult start in life I think he may have been in prison during this time but I am not sure how to check this, can anyone help ? Thanks in advance