I dont like it either,but they may well get to do it as its not dealing with the United States Of Europe,but many states.However a route Man-Stn is an internal trip in the UK,surely these types of ops could be sorted.
By and large when you see UPS do this in Europe they use StarAir.Cgn Dub Snn and Cgn Lys TLs being examples.
Politicians took away our Duty Free,but united unity union alas still mean nothing officially for us.It is these people that must change the way things happen.I have argued against this here in the past but now accept no Americans are doing wrong,things must change so that what is happening is wrong,until then I will look jealously at their 757s on the ramp in Cologne and hope.