Yes, the Association might be the vehicle. I would be willing to help with canvassing on banklineonline.com or the bankline nostalgia site on Facebook.
Re the location. I am not familiar with the Bury St area these days but it's obviously important that the location should be significant, i.e. relevant. I suppose the citation blurb could read - " Opposite this plaque stood the headquarters of an iconic shipping company .......etc. etc..." Not sure what usually goes in the text, but would like to have a stab at the wording!!