This really is sad, Arlen unfortunately and I'll quote from the site.
"You must be a British citizen or resident to sign the petition.Or, if you're an expatriate, you're in an overseas territory, a Crown dependency or in the Armed Forces without a postcode, please select from this list:"

If I could I would sign the petition gladly, my Grandmother was a highland dancer, many were the times she would regale us with stories of the sword dancing.