@ Aktung: No, this is at the top

@ Markus: In operation only in the UK - although I stand to be corrected - but would be recognised in many countries around the world

What does it fire, water?

No, not water

Civilian ?

Markus

Neither civilian nor military - I probably can't say more without giving it right away but you'll see why when it's revealed. As I suggested earlier to Aktung, it's best described as 'martial'

^ No it isn't

Used on daily basis ?

Markus

I'd better give you a clue:

It's from fiction - in which stories it would be used on a daily basis. In real life it's only in use when filming

British, indeed. And - since I suspect you're about to nail it anyhow - here's another clue

https://i.imgur.com/mgVqHrQ.jpg

Little Nellie?
Just because of the colour ..

^ Nope, not Little Nellie