Paul,
Your best chances are to check the Kelly's Dictionary of Southampton for the year 1911. Most are obtainable at the local Library at the Civic Centre.
If Joughlin was living in rented accommodation then this level of research could prove to be extremely difficult. I will give you one perfect example to support this case, the name I'm focusing directly upon is to do with Arthur Lewis.
If you look carefully at Lewis's biography your notice he is listed on the Titanic's Crew Manifest, as giving his address at Number 99, Radcliffe Road, Northam, Southampton.
Directly opposite my late grandfather lived at Number 100, Radcliffe Road. He could always remember Lewis as a quiet man who went about his oridinary business not bothering a soul in mind. Long before the Lewis's moved to the Innner Avenue in Southampton, he and his wife Vi Lewis were both renting rooms at Number 99 which was owned then, by Mrs Phillips.
It wasn't until I turned my attention with my Uncle Alf, who put me very much in the picture of what really happened during that frantic time back in 1912, I soon learnt that most of my problems could have sovlved many years beforehand.
This is just one episcode of the Titanic's Crew, there are many more challegnes to take on board, but saying that, I strongly advise you to check the Kelly's first. Failing that of course, then you chances of checking the British Census for 1901 (Southampton) could be your best option to consider as second.
I hope this helps and gives you an in-depth idea of what your about to embark.
Any problems then give us a shout!
Best wishes
Andrew W.