They are doing without the containers in Slough...
Revealed: Up to 6,000 'beds in sheds' set-up by rogue landlords are found by spy plane's thermal image camera
Slough Borough Council spends £24,000 building up 3D map from air
Authority uncovered 6,350 suspicious sheds and garages emitting heat
Thousands could be living in converted outbuildings without permission
Plane criss-crossed streets, picking up heat signals from outbuildings
Analysis of images from night flight revealed suspicious dwellings
By Martin Robinson and Mark Duell
Published: 16:57, 30 July 2013 | Updated: 07:51, 31 July 2013
A spy plane equipped with a thermal imaging camera has found that more than 6,000 outbuildings in one town could be 'beds in sheds' converted by rogue landlords.
Slough Borough Council is the first local authority in the country to pay for the specially-adapted aircraft to fly over streets picking up heat from sheds and garages.
It spent £24,000 on flights to build up a precise 3D map of every building in the Berkshire town. The results mean thousands could be living there without planning permission or contributing council tax.

Welcome to Slough: This thermogram image shows data recovered after flying over the town, with the red representing high levels of heat escaping. The council said the imaging helps them identify outhouses because the cameras can pick up areas of high heat loss - although few can be seen outside the houses in this snippet

Normally: This satellite view from Google Maps shows the area captured by the 3D thermal imaging software in Slough, Berkshire. A school is seen to the right, while the rest of the area is mostly residential
More:
http://www.dailymail.co.uk/news/article-2381451/Slough-spy-plane-detects-6-000-illegal-beds-sheds-thermal-imaging.html