Hot toddy - whiskey*, hot water, honey, lemon juice with a couple of aspirins or paracetamol. The only cure. Repeat as often as necessary.
Personally I like whiskey*, hot MILK, and honey, but the milk does encourage the formation of mucus, or as it's called by medical researchers, snot.
I use *Power's Gold Label, but I'm of Irish descent, so it's approved for medical use in my case.