Do you have a HC2 certificate? If so you can get cold sore stuff on prescription - otherwise it's about £5 or £6 which is v expensive.
L-lysine supplements are supposed to be good - you can get it in and healthfood shop, and bigger Boots. Not tried it personally, as I'm lucky enough not to get cold sores, but my friend swears by hte stuff...
What about toothpaste? Works for spots, so why not coldsores?
Blistex is meant to be quite good, I think it's cheaper? Pharmacies will do own brand versions of Zovirax as well.
There's 'Soothelip', which is 5% aciclovir, exactly the same as 'Zovirax'. Still just over £4, but significantly cheaper. Definitely sold in Lloydspharmacy - don't know about anywhere else though.
Perfume or Aftershave. Just a little dab. Seriously worked for me several times.
Take it to the park.
I'm sorry, it was too obvious
zorirax is the best thing for cold sores except its so expencive..... i work in a hospital, so i am able to aquire it for free (sshhhh dont tell any one).
there are cheeper options but not as good
the other thing i use is the alcohol hand gell or wipes that we use at work, they sting like buggery but their good at getting rid of spots and cold sores!!!!