Honey and hot lemon, as everyone else has said - works wonders, although don't drink too much or you'll be hyper and flu-ey (this may or may not be the voice of experience).

Failing that, gargling with dispersible aspirin or salt water - the aspirin will reduce any swelling, or the salt water will kill any bugs. I can only gargle really quickly with these two though, as both options make me want to throw up :S

The standard Bradford/West Yorkshire cure for a bad throat/stuffy head is a hot curry - hot as you can stand without causing yourself injury. Kills all known germs, plus the veg replenishes your vit C \o/