If the flights are delayed at all sorts of hours...is there sufficient to do in the airport to keep occupied eg is the Garfunkels steak restaurant open 24 hours?, does the Shopping Village accept Euros?
and does WH Smiths sell UK newspapers??
When I was last there the Harrods outlet had some fantastic ski wear bargins, sunglass hut was £15 - £20 cheaper that UK duty frees, the Curry's digital outlet had PS3's a month before the UK launch but the costa coffee was hot.
I was particularly impressed with Harry Ramsdens, although I believe that this is now a Jamie Oliver restuarant.
The Red Lion pub is still going very strong though