Other London check-in facilities were offered by Pam Am and British Eagle. Pam Am was near Victoria stn while British Eagle was in Knightsbridge close to Harrods.
Does anyone remember the glory days of SAS in the Eighties when guests staying in its hotels could check-in at an SAS counter in the lobby ? That was so convenient.
Also biz class passengers arriving on SAS and staying at an SAS hotel would have their luggage automatically transferred FOC to their hotel room.