To toss another idea into the discussion....
I was thinking about a Herefordian accent in Middlesex answering a census enumerator. He may only have lived where he was born for a short while, and also I notice in 1881 the enumerator has only put Bridge, Cornwall for his wife's birthplace ! Not one for accuracy perhaps ?
So, how about Croft Ambrey ? Near Leominster . There is a Joseph Griffiths aged 10 in the Parish of Eye on the 1851 Census, that is also near Croft Ambrey.
just a thought................