You want to know about beer? Take a seat! And Peedal will be along soon to help, I am sure!
There are several different drinks which come under the general heading 'beer', several of which bear no relation to each other.
The main one would be lager. This is a light, fizzy, gassy liquid which is usually golden in colour. Most people in the UK seem to drink this. Lager can be split into two categories - strong or 'premium' or regular. Regular will be Fosters, Carling, Carlsberg...they are not too strong and (IMHO) have little flavour. Stronger lagers are Stella Artois and Kronenberg, which have more flavour, and will get you more drunk. Some people call Stella 'Wife Beater', for obvious reasons!
The next kind of beer is 'cask beer' or 'Real Ale'. For everything you want to know about ales, look at
www.camra.org These are not fizzy, and are richer in flavour and usually darker. There are thousands of ales, but most pubs in the UK will be tied to a chain so will serve a small selection such as Fullers or Youngs. Black Sheep is one of these, and it is lovely. Ales can range from pale and honey flavoured, to thick and dark with hints of coffe and raspberry...really, it is a subject worth researching, and I am sure that with enough looking around you would find something you like.
Other beers...there is Stout, which would include Guinness, and fruit beers, which are more readily available these days. Also wheat beers, such as Hoegarden.
All of the above are available in cans and bottles in supermarkets and off-licenses.
My opinion - Fosters tastes like sheep pi$$. Stick to Ale.
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And a 'chav' is sort of like 'trailor trash', ie poor, common, badly brought up, on welfare, pregnant at 14....Britney with less money.
Vicky