Check out companies like Serviceair, Aviance, Menzies Aviation Group, Execair (owned by Menzies) I haven't got a clue about their email addys or web addresses. They do ground handling and agent work. Check out easyJet, Monarch, Britannia, British Airways etc for any jobs going with them. They often put the details of ground jobs on their websites.
Be prepared to go through a security bun fight. It used to be a 2 year background check, now it's 5 years. It's like the Australian one but it is a bit more difficult when all your friends and contacts are 10,000 miles away.