It would"nt matter a bit,what temperature your Tetleys was served at!
You were drinking a keg beer,in other words,not much more than coloured,carbonated water.
But do not be dismayed!A previous poster mentioned that a lot of Pubs tend to employ young staff.I dont know,may be to attract a younger crowd,who will probably drink Lager,which to a manager,who will be on a wage,is far easier to "keep".Lager is also keg,under pressure,and carbonated on serving,which gives the product longer life.
But,as I said,do not despair.There is presently a resurgence in brewing Real Ale in the U.K.It is said to be one of the main growth areas in the Pub trade.Many Micro-breweries are popping up all over the place.The Pubs that buy in from these Micro-breweries tend to have knowledgable staff,and skilled Cellarmen.When you next venture out for a pint and something to eat,try a bit of Googling for Pubs with Real Ale in your area(preferably with a range of local Micro Ale),you may be pleasantly surprised!Cheers!