Thank you
TightSlot for your comments that are particularly helpful when placed against the very informative post by
Betty girl.
It would seem that the PRM (Passengers with Reduced Mobility) service at LHR is provided by AirServ, who unless I am mistaken also sport the name OmniServ:-
___link
AirServe evidently provides PRM service at LHR, LBA & MAN.
_ But they are essentially a USA firm and so it would seem that I should not blame AirServe but I should blame the UK culture which has forced this firm to cheapen its service in order to conform with what we Brits will accept.