Where to buy ammonia

[Idris]

What supermarket products (in the UK) are a good surse of ammonia. Or can I get some from the fish shop?
I'm no expert on cleaning products, but I didn't know you could buy the stuff (except by getting a Winchester from BDH).

 

[benzonar]

You can pick it up in Homebase.

White bottle, blue writing. "Household Ammonia"

Its about £1.99 for 500ml which is more than enough. You can use it to clean the cooker as well, although it stinks your house out.