my mom once told me that outdoor cats (or cats allowed to live outdoors) have a life expectancy of two years. cats who live out their lives indoors typically have a much longer life expectancy.

if you're feeling particularly ... uh... *insert word here that i can't think of* you might try looking up the factual information, and seeing what those numbers are for the UK and bringing that information to the attention of the shelter.

or, just look for another shelter. *shrug*

Good luck!