Sometimes I forget an obvious source. A Muster List was taken in early August 1803 covering all men aged 17 to 55. That for Dean includes:
Wm. Burges, taylor, 2 children under 10, class 3
John Burges, taylor, class 1
Class 1 included men between 17 and 30, unmarried, no children living under 10.
Class 3 covered men between 17 and 30, married, OR having 2 children under 10
In my reply #11 below I was clearly wrong in applying 3 children to William before 1800 - one of the three couldn't have been his. And his age seems to have been younger than his burial age implies.
Non-conformists can be very frustrating!
David