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You won't find a birth certificate for John as he was born long before civil registration was introduced in England on 1 July 1837. A baptism is the best you can hope for.
You say you have his marriage - can you give us details of that?
Is he this man?
1851: John LIGHTELL, 40 b Dunkerley Northumberland, in Bishopwearmouth (wife Catherine).
1861: John LEIGHTON, 50 b Charlton Northumberland, in Bishopwearmouth (wife Catherine).
1871: John LIGHTELL, 60 b Sunderland, in Bishopwearmouth (wife Catherine).