Hi
That does sound promising! Wondering - if this turns out to be the correct family - whether Tom died in England?
Have just been looking at Thomas Young deaths between 1842 (when son Thomas was baptised in Cork) and 1851 when his wife Catherine was shown as 'widow' in the 1851 Census.
Difficult to pin down, especially as no confirmation of age - was he born in c 1806 like his wife?
Incidentally, did you notice the 1851 address of 'Ruins' in Ratcliff Hamlet? It wasn't a great environment all round there (my ancestors lived there too), but this takes it a bit far.......google doesn't show much.
ADDED:
I have found two possible death refs, one in 1846 in Stepney for a Thomas Young aged 32 (so dob 1814) and another in 1848 in Stepney aged 40, so born 1808 (which might be a better match for Catherine who is either born in 1808, or 1811 (the latter less likely as it produces a rounded age for the census)
I may take a punt on the second death cert, on behalf of the person I'm doing the research for - though of course it won't tell me much, and unless it's the same address as the 1851 census and/or the notifier is Catherine Young, we won't know for definite it's him anyway