Birth of a Beryl I SKIPPER was registered in the March quarter of 1935 at Kings lynn (Volume 4b Page 362) her mother's maiden name was RUDDERHAM.

Marriage of a Beryl I Skipper was registered in the December quarter of 1960 at kings Lynn (Volume 4b Page 1122) her spouse's name was Roger E AVERY.

This information is from the bmd indices at http://www.freebmd.org.uk/ which are free to view.

Copy entries of birth and marriage showing potentially helpful data can be obtained for £9.25 each from http://www.gro.gov.uk/gro/content/certificates/

Do please take extreme care in any approach to your grandmother's Avery family who may be totally unaware of the 1958 adoption.

Good luck