No probs, Bunny
From a slightly ambiguous death notice in a Bury newspaper, I'm currently working on the hypothesis that the William Prigg who married Frances Leach was the son of Robert Prigg of Bury St Edmunds, probably a successful tailor. Think William started in that trade and maybe finished as a carver & gilder
Following that family down has been interesting, including a Secretary of State for Oregon, a surgeon who was accidentally shot in Kensington and a vicar who used to ride to the top of the hill overlooking his parish and see if there was a signal from below on whether it was worth his while coming down (he ended up with a congregation of just 3). Also a name change to Trigg

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I don't know whether you've seen this site for all things Leach
http://davidparrhouse.org/with quite a full history of one side of the family here
http://www.rootschat.com/links/01hcr/ Frances Leach was Barnett III's sister
Infuriatingly, that exhibition only came up in my Google search a few days after it had finished
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I've started looking at the Hopkins - makers of the finest brawn in the kingdom - and that's starting to get interesting too - will disputes, brewers, mayors of Cambridge, that sort of thing
There'll be some nice houses to visit when I get the chance
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As for Charles Prague, not a lot about him, I'm afraid. He married in Hoxton, possibly widowed though I'm not sure that they separated instead and then headed down to Folkestone for a life of violinism and artistry (though I haven't come across any surviving examples of that). Didn't trouble the scorers child-wise as far as I know.
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I did look through a film of the All Saints registers for your George but didn't spot him. St Edward's is another church that is starting to appear a fair bit though.
Let me know if you're looking for any specific dates. I'm trying to track all my blood relations so might be in luck
Steve