Flew from LGW-GLA last night. Gate was due to be displayed at 18:35 but instead we got a "Please wait" message which was shown for 40 minutes. When we finally got to the gate we were held in the usual cattle pen until we boarded. The GA announced that Groups 1,2 and 3 should board. On such a flight this must have meant almost the entire flight could board in the first group. Farcical.