That’s exactly what I heard. Apparently, in the mid 80s a significant number of the bungalows / sheds / cottages were going to be flattened. It was a done deal. When it was agreed they could stay they became the Type B leases. There’s a book I’m trying to get a copy of but can’t find anywhere: A History of the River Thurne Bungalows https://www.amazon.co.uk/dp/B00BZUNFJC/ref=cm_sw_r_cp_api_IUd0AbATXB77G However, the lady who wrote it assures me she’s updating it and will be releasing a new version soon. We (the Tenants association) had a litter pick recently around Potter and it was fascinating to talk to some of the people who have been involved for years.