Just wondering why this doesn't seem to be done?
"A woman who travelled the world while claiming benefits for acute agoraphobia has been told to expect a jail sentence.
Tracy Johnson, 52, claimed to be too unwell to leave her house, yet enjoyed a "champagne lifestyle", writing travel guides, cookbooks and steamy novels while falsely claiming benefits of about £50,000.
As well as a four-month stint in India, Johnson, who has a son, went on shopping sprees in New York and Madrid. A court also heard she spent six months working in Argentina as a tour guide while receiving cold winter payments.
The day after telling benefits officials she could not walk more than five metres (16ft) without help, Johnson went on a two-day trip to central London."
http://www.theguardian.com/uk-news/2014/apr/07/agoraphobic-woman-travelled-...
In Oz, the DSS data match once a week with people leaving the country based on name and passport number and suspend payment where necessary.
I did work in DWP in London for a while and remember them being a bit incompetent so maybe a simple thing like this is beyond them.