I have just seen a BBC report saying the Police are concerned as the blue flashing lights are playing havoc for the Police helicopters to spot emergency vehicles at scenes of accidents below them.
http://www.bbc.co.uk/news/uk-england-20888663
Good - lets get back to traditional colours of red, green and white! (in my humble opinion!) LOL ;)
We have had them in the town centre trees for many years. (Obviously can't afford new ones if they are paying the Council allowances) and they are very pretty.