In Germany you normally buy all your drinks in crates in large supermarkets that more or less only sell beverages ("Getränkemarkt"). You can chose between hundreds of different brands of water, beer, juices, soft drinks and of course all the harder stuff too. Nothing is ever specially secured or locked aways unless it is really expensive.
In the UK I so far have never found anything similar. Drinks get bought together with the normal supermarket shopping and the variety is not really that great. Especially the choice of sparkling water is unbelievably poor on the island. Hardly anything that isn´t alcoholic comes in a glass bottle.
I´m not saying that the overwhelming choice you have in Germany is really needed but once you´re used to it...
PS: By the way: In the UK all bottles have no deposit on them...very green indeed, not.