Looks like it as I have a flight departing GLA to LGW June 4 returning June 17 with a long haul connection at LGW. Just checked BA.com for those dates and no GLA-LGW-GLA flights.

MMB still shows the flights as being intact, just awaiting formal notice of this now, will have to go down to LHR the day before as the 1st flight from GLA on June 4 arrives at LHR 08:35. We will have luggage so reclaiming the bags and getting over LGW is way too tight for my liking for a 12 noon departure. Makes the return equally a pain of transferring from LGW to LHR.