Design, engineering and management consultancy WSP has appointed BSI as its UK conference, venue-finding and accommodation provider.
BSI's appointment follows a three-month trial period that began in October last year.
WSP has made use of BSI's online self-booking tool, BSI Direct, which is anticipated to be used by some 400 WSP employees.
WSP UK procurement manager Humi Asif said: "By appointing BSI, we feel confident that we will not only achieve preferential rates for accommodation and meetings but also help our staff reduce the time needed to make and manage bookings."
BSI group managing director Trevor Elswood claimed the agency was "already introducing changes that will deliver immediate and long term savings".