Lookup Marriage of John RICKARD to Catherine ?

Lookup Suname of Catherine ?
I have the Census records 1841,51,61 etc but I can't locate this marriage and surname of his wife Catherine.
Temperance Ann Rickard married Henry Davey and came to South Australia.
If anyone in England can help with any information on this family it would be greatfully received.

e.g.
1851 England Census - Tywardreath HO107/1906 Folio 126 Page 3
John Rickard 39 Head - Copper Miner - Born Camborne
Catharine Rickard 39 Wife - Born St Agnes
Jane Rickard 16 Dau - Works at Copper mines - Born St Blazey
Mary Rickard 14 Dau - Born St Blazey
Temperance Ann Rickard 11 Dau - Scholar - Born St Blazey
Catharine Rickard 9 Dau - Born St Blazey
William John Rickard 7 Son - Born St Blazey.
John Rickard 4 Son - Born Tywardreath
Ann Lillina Rickard 1 Dau - Born St Blazey
Stephen Rickard 18 Visitor Nephew -
Stephen Rickard 45 Visitor (Brother) - born Camborne
William Richard 19 Visitor Nephew - Born Camborne
John Joll 23 Nephew - Copper Miner - Born St Blazey
Gaynor 50