Outdoor Heaters removed from Upper Street Bars

At our prompting, Islington Council has taken planning enforcement action against several Upper Street bars and restaurants who had screwed high power electric heaters to the front wall. Upper Street falls inside a conservation area and these heaters didn't have planning permission (and most likely wouldn't get it).

Five bars have removed their heaters. However one (102 Upper Street) claims that the heaters have been up for 4 years and were able to prove this to the council.

Of course, all outdoor heaters should be banned in the UK. But bar owners will do anything to keep their customers warm. Anyone know of other outside visible heaters on buildings in conservation areas?

Photo gallery of all the bars and their heaters