Depends what kind of cargo. Long haul freight wise the UK is more of an end point receiver for main deck freight ex stansted than as a staging post that encourages home grown operators. Frankfurt is a big main deck freight staging post, other places around the world you'll see it such as Hong Kong, Amsterdam, Almaty, Dubai, Shanghai, Chicago, Dallas, Lagos etc. as an end point user you get quite a few foreign players flying into EMA, stansted etc. The problem is return loads to fill main deck. Belly cargo is more the thing in the UK transiting through London. Parcel wise, I'm not sure but the UK being small, the trucking network takes up a lot of capacity once flown in via likes of DHL etc.