When you list an item on Ebay, Even if you put UK only people in other countries can bid on your item which can ruin your sale if you are not wishing to sell abroad,To stop people abroad bidding on your items you need to edit your seller preferences and add buy requirements,Heres what to do for those who dont know,
To add buyer requirements to your listings:
In My eBay, under the My Account column, click the "Preferences" link.
In the Site Preferences section, click the Edit link. The Buyer Requirements page opens.
Select your buyer requirements. These include blocking buyers who:
Are registered in countries to which you don't post
Have a feedback score of -1,-2,-3 or lower
Have received two Unpaid Item strikes in the last 30 days
Have reportedly breached eBay policies
Are currently winning or have bought '1-100' of your items in the last 10 days
Do not have a PayPal account
Click the Submit button to save your requirements