You're welcome. Sorry to question Robert's mother's name, 'Marr'. The English marriage certs. only name fathers, therefore I couldn't understand how you were certain of his mother's maiden name. The Scottish system is certainly more helpful.
The information for these census is given by word of mouth, therefore local accent and the numerators ability to spell often results in misinformation. The 1911 census is different, it is written by the head of household, providing he can write, and is usually more accurate.