Nothing about it on their web-site:
http://www.ual.com/site/primary/0,10017,1394,00.html
Another link for UK employment with them is:
http://www.unitedairlines.co.uk/0523.htm
Basically asking for a CV for any job you might be interested in to be sent to
People Services
United Airlines
United House
Southern Perimeter Road
Heathrow Airport
TW6 3LP
Might be worth the cost of a letter!
GA