Just looked at the census for ''D Pietard'' Maddy and I think this is probably him (or at least it's the best match so far)! He often was down as a general dealer and the birth and birth place are correct.
The only thing is that he put that his 5 children were living when 1 had died, but this could have been a mistake and his son died while he was in prison so there's a small chance he didn't even know...
Thank you for finding this!

I agree with what you said about the married/divorced part on the 1911 census for Julia- makes it more likely to be her.
Will look for 85a Marshall Street now, thanks for that information too