and the concentrate had NO PRESERVATIVES? namely potassium sorbate...
cuz its either been preserved, or the pH is so far off the yeast can't do anything.
or all your yeast is dead, but I doubt that unless its 2 years expired and was stored in a tin shed all summer.
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10