Unless you have a bus pass, do not use Stagecoach, they're totally ripping you off. I had to go from BBC to the uni (it's like a 10min walk I know) and they tried to charge me £1.30. Not impressed. Also, there's the 147 free bus (free when you take it on Oxford Road) that goes from the hospital to Piccadilly station, and it's pretty useful when you wanna get to the train station quickly.