Luton has a stream of jets. having flown in there numerous times separation is a big thing on the STAR and you will be requested numerous times to adjust speed between yourself and other Jets
Other than in an emergency I don't think you would be very welcome flying down the approach at 80 to 100 KTS especially with no intention of landing there
Didn't used to be that way as I can remember Donkeys years ago flying with mates into Manchester, Parking the PA28 on a the main apron alongside a 757 and going up into the terminal for a coffee
The same with Luton where you taxied around the perimeter track to the flying club
Oh those days of freedom and multiple airfields around the UK most closed, turned into housing estates or car parking areas