Eric Liddell (the film Chariots of Fire was about him)
George Band (youngest member of the first successful Everest expedition)
Phil Packer (the injured soldier who you may remember completing the 2009 London Marathon in 13 days)
Most recently one of the lead singers from Out Of The Blue (Britain's Got Talent 2011) went to my primary school, secondary school and college, and there are a few pictures around our school of him being in musicals which our school did.
My school also had Richard Armitage as a student...which is cool I guess.
and several members from the band Kasabian went to the school I could have gone to (Countesthorpe).