Penny,

My book says that the 'ing' ending is Saxon meaning 'The people of' I think Barking was "Boerca's people" or something like that.

I'll have to look up Messing again. I think it was somewhat upstream from Mucking. I used to drive to work through Fobbing and Corringham every day. And you're right they were prominent at the start of the Peasant's revolt along with Brentford.

Bert.