Hi again,
Just remembered the other family name the Gumbles were related to is Spencer, they lived very, very close to the Gumbles on the Nazeing Road, in Dobbs Weir Essex on the Herts Essex boarder.
Although both famlies had caravans, they lived in houses for most of the year, the Gumbles lived on the Council Estate in Roydon and the Spencers lived in their private bungalow which had quite a lot of land. The Gumbles were short, dark hair and socky whereas the Spencers were tall, slim and blonde. I had hoped to find a school photo but sadly I don't have any class photo's. Regards Jackie