You are looking for a medium-size container with room for a few swappables and trackables.
Congratulations to BD1234 and rr300tdi for your joint FTF, hope you make good use of your magnetic micro bonus prize
I drive past this spot on a daily basis and have been eyeing it up for some time. This appears to be a waiting area for Taxi's waiting for their fares to arrive at East Midlands Airport so stealth and/or luck of timing will be needed when retrieving this cache.