Mary,
I'm afraid that I was initially trying a stab in the dark, trying to find a Thomas DYSON who was given as a witness at the second wedding of a James Greaves DYSON in King's Norton in 1871. His grandfather was the William DYSON whom I've been trying to establish (it seems for ever, now) as having been born in Ashton...
Just looking for some kind of possible family connection - there weren't all that many Thomas DYSON's listed in the 1881 Census, and I just happened on the one in Oldham; then became perplexed by the details of the entry.
Maybe I've caused a bit of a storm in a tea-cup over someone not even related to J.G.Dyson - though threads plucked out of the air like the monthly Rootschat Challenge seem to get a real head of steam up.
But one is still curious about that DYSON family that I unearthed, and I am sure if we were certain about INGHAM or not, we'd have found that family somewhere in Plymouth by now...
Keith (you asked for a ramble, and you got one - I've just re-read this...)