No problem Nick
I had a check through the French Hospital records, and the sister of Pierre (b.1702) who left the will, Catherine Aumonier/Chargelique (1706-1794), also died there, and gives the info the family were originally from "Dicheny, Upper Poitou".
There is also a Jacques Aumonier (1684-1765) who entered the hospital 1757, nominated by the Society of Poitou, and gave his origin as 'La Mothe, Poitou"
In addition a Pierre Aumonier, widow remarried at La Patente in 1720, to a Marie, widow. He was described as a native of "Cheez, Poitou" and she "Lusignan, Poitou". Whether this Pierre born circa 1681, or his father is unclear.
La Mothe is fairly easy to find on a modern map, and quite a few Protestant refugees to England hailed from there. Dicheny and Cheez, no sign of, BUT..immediately South of La Mothe are two small neighbouring villages Chey and Chenay. I think Cheez therefore refers to Chey, and Dicheny should perhaps read "DE Chenay" i.e, of Chenay.
I realise this is earlier than the period you are looking at, but you never know might help.
Someone seems to have done some previous research into the family in the 20th century as an article was published in volume 18 of the Huguenot Proceedings in 1952, snippet view here:
http://books.google.co.uk/books?ei=lBVbTPfKC8r84Aamg5mHAg&ct=book-thumbnail&id=YBrkAAAAMAAJ&dq=%22PIERRE+AUMONIER%22%2BHUGUENOT%2BPOITOU&q=%22PIERRE+AUMONIER%22#search_anchorIn addition I had a look on "London Lives" and there is an original copy of David Aumoniers signature on a petition there from the 1780's. Also the rather unexpected info that he was convicted of a felony at the age of 60, and was given 6 months in the house of correction and a 1 shilling fine. No clue as to what he had done there. A description is given of him as dark eyes and complexion, 5 foot 5, wears a wig. He had moved into Bethnal Green by that time, and was working as a fishmonger. The earlier references to him s a shoemaker in Wheeler Street Spitalfields all date from the 1760's, so he had changed profession, wether through choice or neccesity who knows. As I say he was clearly respected in his community, the amount of references he gives to the French Hospital that are accepted evidenced this alone. Both he and his sister Marie Aumonier/Golay were involved with the Westminster French Protestant school, and had children apprenticed to them. So what he did wrong, and that late in his life, is a real mystery...
Of course none of this gets you any nearer to identifying the link between Marie Ann and Frederic I realise. As Valda suggests it might be worth contacting the Huguenot Society. They have recently digitised the proceedings to put online so may be helpful in fowarding the full Aumonier article.
Regards
Richard