Handy if you have a child, or can borrow one.
From The Telegraph:
For your chance to win, and for full terms and conditions, click on the map above and use the zoom feature to navigate your way around the map and find the snail. Once you have found the snail, click on it, register your details and save your entry.
Once you have registered, you will automatically be entered into the prize draw to win £5,000 to be spent on Premium Bonds in the name of a child (or split between children) of your choice. If you are 17 or under you can win this prize for yourself (parental permission is required for anyone under the age of 16).
All entries must be received by November 5, 2007. The winner will be notified by email within seven days of the closing date and their name will be published on the site.http://www.telegraph.co.uk/portal/main.jhtml?view=CAMPAIGN&grid=A1NoGoogle&pg=/ETHtml/content/promotions/2007/09/26/snail_competition/index.jhtml&pc=Telegraph%20Snail%20Competition