Luton Airport, probably not the nicest of airports in London, however, there is a lounge that will take you away from the horrible design of the airport, till you board your flight.
A few years ago the lounge underwent a large refurbishment. It is the only lounge at Luton, located after security and clearly signposted from the main shopping area of the airport. Anyone can access the lounge if they pay, or have got an arrangement with their airline.
Food offering changes daily, The lounge also offers a Bliss spa for you to unwind before that long flight.
From £26 for three hours and all you can eat.
Or with a lounge access card such as Priority Pass