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Thank you for that, Rosie99. I hadn't realised that would be relevant, just wondered if anyone knew the address  
Newspaper articles would probably tell me what i'm looking for, I'll go and hunt.
Much appreciated

  Spidermonkey - thank you again for a great link.
I see I've hooked you into the Harry Dean mystery - there are, in fact TEN of them! [Thats if you only count the men who enlisted as Harry, and not those with middle names, which would also have been engraved on their death penny] 
I'm aiming to produce a mini 'biography for each of the ten - most have been relatively easy to start off, but both Lambeth man [#5] and Hockley man [#7] have necessitated me begging for help.  Happy to share what I get when it's all put together, if you'd be interested.

Spider monkey, the family probably didn't have a lot of choice!  Over 100,000 children were emigrated from the UK to Canada over the years. Some were orphans, very many weren't.  My two great uncles were sent in 1909 from a local children's home in Wolverhampton - both parents still alive, but very poor.  Once the boys reached the age of 5 they were considered old enough to work, and both countries did pretty well out of the exchange financially - it was just the families and children who didn't always see an positive results!
Some of the children were well treated and made a good life, others were treated pretty much as slaves. Many died young, many ran away and there were more than a few incidences of suicide.
 Happy to pass on links if you'd like to read more about the system.  There's also a really good group on Facebook if you find any family links that you need to explore.
I've declared this query resolved now - thank you to everyone - I wouldn't have got this far, or even close -  on my own!  Your time and effort is really appreciated 

 
I think we'd make a great detective between us!!
Yes,  the 1911 Shoebury  Harry Dean is the same as the 1901 Great Wakering Harry Fox.  I'm pretty confident this is the man, and will get a birth certificate to confirm at least one parent!
As far as fitting in with the Joslins, they were in the same village, with pretty small population, I suspect that it was a case of him latching on to a mother substitute who would offer a bit of support [but don't have any primary evidence for that, at this stage it's a hunch!!]
Caroline L shows as Caroline L Dean in 1891, relation to head - stepdaughter.  Head of household was Robert Deane, wife Sarah - married 1873, Rochford.
So, it appears that Caroline is likely the mother of Harry, and half sister to the Dean brothers. This explains why Harry took the surname Dean.
Spidermonkey -  top marks for observation! There isn't a physical link between the this and the Lambeth Harry Dean [as far as I know - that really would freak me out!!]  I have a WW1 Death Penny in the name of Harry Dean and am trying to research possibilities to be able to make sure whichever one he was, he will be remembered. 
 Great work, team, much appreciated!!

Monday morning update 
I'm beginning to get a better picture of this now, i think.
The baptism of the Harry Dean in Hockley, Birmingham is definitely not the Harry Dean in Earth Pit Row.  Following the Hockley one forward, he is still with parents George and Minnie in Shifnal in 1901 and as William henry in 1911. So, that's definitely not the one.
The Earth Pit Row man is the right one - but so far, I'm failing to link him to the Wiggins family. I'm beginning to wonder if he 'adopted' Eliza as his aunt in lieu of having a known next of kin when he enlisted.
None of the military documents list another name to link him to.
Thank you to everybody for the sterling help on this one, very much appreciated!!

Updated to add:  There are a few Deans in Great Wakering in 1901: in New Road- brothers James 24, Albert 22, George 20 and sister Lily 18.  They have a boarder, Harry FOX right age, for my Harry Dean, born in the right place.  No mother's maiden name on the birth registration, and his younger brother, Charlie was born in Hockley .......