Hi Tony,
Have you tried West Norfolk Council? www.west-norfolk.gov.uk I myself work for a local council (not in Norfolk) and our civil defence records are kept in our town hall. It may be the same case with West Norfolk Council and also it might be worth checking out records via their library dept as most council's have a local history section. If this fails to get you further you could always write to The Lynn News, a local news paper which covers the area where you are searching - http://www.kingslynntoday.co.uk they may be able to help or point you in the right direction.
Andy Whitfield,
Greenman....
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