Somerset....cider territory. To be honest, I would expect the real ale to be a bit crap there......
You need to venture further up north. Timothy Taylors Landlord is ok....but try the Black Sheep, Best or Special, great brews. Theakstons XXXB or Old Perculiar are more. Roosters still do a damn good drop, summer ales should still be on there, lovely hoppy ales ripe for session drinking. These are the reasons why I spent so much money on importing a beer engine.
Stay away from the gas pumped 'Extra Smooth' like Tetleys and John Smiths, the taste, well, odd.
Warm and flat, you mean you could taste it? Its the style, you should have really know that when you ventured out
Honestly, try drinking a Crown at cellar temperature, bleugh. Lager is served so cold that it shocks the tastebuds and stops you from tasting it. Great for getting pissed on a hot summers day, not great for sitting in the snug/tap room when its cooler.
Oh and Carlsberg
is watery. If you really must, at least drink Carlsberg Export or Lowenbrau. Wife-beater (Stella Artois) is crap, unless you're drinking it on the continent where it tends to be better, so try it in France.
Ah...the old country, the only reason that I'd go back is the beer.