a cpl things, without even looking at your live site.. Here is a google cached page:
https://74.125.95.104/search?q=cache:38Gago1vFrwJ:www.carbonneutraltourism.co.uk/2008/07/+carbonneutraltourism.co.uk+cialis&hl=en&ct=clnk&cd=4&gl=us
view the source of that page, and search for cialis, and you’ll see this:
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that’s hacked.
Now, your current theme is different than whats in the cached page, and looking at the source of whats live, youre theme isnt showing symptoms of being hacked.
Thats not to say that your site isnt compromised right now, it may very be. It was at one point, after all.