haha people are always inheriting large fortunes from people who aren't related to them in Downton - look at Matthew. Two major inheritances in less than three series, from a third cousin once removed, and then his ex-fiance's father.
exactly, he was Lord Grantham's nearest male heir, and the fiance of what's-his-name who had no living dependents or heirs
absolutely no suggestion of dodgy behaviour at all; to the contrary, nearly-father-in-law's posthumous validation of Matthew cancels out any suspicion of inappropriateness in his relationship to Lavinia
and as for the Grantham inheritance, the property was entailed: he had to inherit by law, whether the Granthams liked it or not
same with Daisy- no scandal: that was precisely why William married her, so she would be provided for in an acceptable way
Mr Blake- no scandal- money normally goes to the nearest relative
money is left to exactly the people you'd expect and not connected to any suggestion of inappropriate behaviour
Mr Gregson otoh is married, he is seen going around London with this young lady of noble birth, then he dies disinheriting his living wife (whose medical bills presumably need paying for!) to leave a bundle to his surely-everybody-knows mistress, who then appears with a mysterious child clearly conceived at the time when Mr Gregson was going around London etc. You would have to be as thick as...well, as somebody in the DA series, not to work out that they had an affair and this is their illegitimate child. Even today, if my husband died suddenly and it was discovered that he had left his money (assuming such a thing was allowed) to the pretty secretary at work- people would talk. For an Earl's daughter with the eyes of the world upon her, they were going to talk a lot. Especially as Edith makes no attempt to cover up but actually goes to live in the flat and manages the business (and does absolutely diddly squat about checking Gregson's sick wife is provided for). Remember in series 2 when Mary nearly had to marry Mr Carlyle because even the suggestion of illicit sex with an unmarried man (though not involving child or inheritance) would have ruined her.
Not sure about the gay club- is the town York? In which case, it was not that small or insignificant. Don't think a lot of research has been done on the provincial gay scene, though.