Westbury on Severn is the correct registration district / office / typically used for Cinderford births at that time.

Name: Elizabeth Harriett Nash
Year of Registration: 1893
Quarter of Registration: Apr-May-Jun
District: Westbury On Severn
County: Gloucestershire
Volume: 6a
Page: 253

is this a couple ?
Name: Charles Nash
Name: Elizabeth Potter
Year of Registration: 1892
Quarter of Registration: Apr-May-Jun
District: Westbury On Severn
County: Gloucestershire
Volume: 6a
Page: 486

1901
Charles Rowland Nash abt 1870 Westbury On Severn, Gloucestershire, England Head St Helen, Lancashire
Elizabeth Nash abt 1871 Cinderford, Gloucestershire, England Wife St Helen, Lancashire
George Nash abt 1897 Cinderford, Gloucestershire, England Son St Helen, Lancashire

< heading to Warrington !!!>

I remember tracking Ambrose Butler in the Bilson area
http://www.forum.forest-of-dean.net/index.php?mode=thread&id=7388#p7393

other surnames KEAR, POTTER, GARDENER