Hello,
I have only just seen your 2008 mention of Sarah Trusdell and as I am chasing all Trowsdale/Truesdell/Trousdales (and other variations) in the Marylebone/Paddington area of London before 1800 - so far without success - you might be able to help.
My direct ancestor is William Trowsdale who married Sarah Sutliffe in 1805. I have found various other Trowsdales/Trusdells in the same area, but so far cannot link any of them to William, or indeed find a record of his birth. William and Sarah's son Charles (my gx2 grandfather) married Eleanor Haytor in 1838, so I am also interested in the Haytor name.
I also have a Thomas Trowsdale who married Elizabeth Dunn in around 1794 (you mention the name Dunn as well), but am not sure if he is connected.
Our family were the "Umbrella Trowsdales" of London, and I too know about William Trowsdale, umbrella maker, from Yorkshire. It seems too much of a co-incidence and very possible that the London family originated in Yorkshire, but I can't see any way of linking the two families.
Now I am clutching at straws, so if you can help I will be very grateful.
tossiez