Ok, now I'm really stuck! Because the one in 1871 which matches Henry snr roughly in age has him as born in Upton, Lancashire & a solicitors clerk. I'm guessing that isn't a normal change of career! Actually looking at it now I'm thinking that it's Eliza in 1881 and she's given her name as Mrs Henry Street as the birth place matches. Was it usual for women to becoem coal merchants?
Here's 1871
RG10; Piece: 2847; Folio: 23; Page: 40
Henery James Street Head 36 bn Upton, Lancashire
Eliza Street 36 bn coventry warks (transcribed nicely on Ancestry as Wancks county

)
Joseph Hardean Street 7 bn Lemmington
Thanks for finding 1881 though, the fact that they're living in the same street helps as now I know that I have the right family in 1871 & I think I found them in 1861 but dismissed them because they were in Lancashire, so now I can go back & find them there. I'll let you know how I get on!
Nico