My parents and two sisters lived in a Prefab in Woodlands Avenue in Hutton Essex. My mother told me how she never ever wanted to leave it when they were given a new 3 bedroom house in Hawthorn Avenue, Brentwood. I will ask my parents if they can locate the pictures of the Prefab which the Oak tree still survives they had in the back garden.
I would think the locals would like the Prefabs to still be there as around 5 blocks of flats were built there in the late 60s and its a war zone with all the local crime eminating from said flats. I have had my car damaged by the kids throwing stuff at you as you drive past. (just a bit of local history for you)