Pengelley/LePage Guernsey

I am looking for information on the marriage date of John Pengelley to Margaret Le Page in Guernsey.I believe they were born about 1803 but I know no details as to their parents. They were my ggg grandparents and I know they had a daughter (Margaret Pengelley) and I am looking for information on her birth date in about 1832.Could anyone find if they are on the 1841 and 1851 Census?I know they arrived in Australia in 1854.

Regards,
Arthur Richardson