Ezra HILL and Elizabeth JONES Whitecroft (General)
Would Ezra and Lydia be an abbreviation or adjustment for other names?
Haven't checked the census image, but could just be a transcription error
Would Cambridgeshire, Glos be a listing for Cambridge, Glos - across the Severn from Lydney?
Yes its either Cam or Cambridge, near Dursley / Slimbridge.