Would reminding BA staff to announce the fact that priority boarding is available for gold and silver BAEC cardholder at boarding be an idea for a "polishing gold/silver" posting

We could sell it to BA as advertising/marketing by prefacing the announcement with "At British Airways, we would like to thank our frequent flyers for flying with us and would like to invite Gold and Silver members of our Executive Club programme to board first on production of their membership cards. If you would like to find out more about our Executive Club programme benefits, please go to our web-site www.ba.com"

The flight crew can make a similar announcement to welcome to pax on take-off, why cant ground crew do the same; or does this extend their responsibilities.

Priority boarding is a very visible way of advertising to non-members the benefit of loyalty to BA with such an announcement.