Cant say I'd be suprised, if it is true. The extra fuel costs that airlines suffer with the MARGO and other restrictions have to tip the balance when airlines get close to the break even. One just has to look at the various ADSB tracking web sites to see just how unbelievably low some of the Glasgow inbounds are. The worst I have seen was 6,000' about 40 miles out. I guess others have considered pulling off the Glasgow London routes. Heathrow charges are going up and passenger taxes are just one more nail in the coffin.
bb