Thanks Colin,
Yes, this is probably the best model that I know in existence. One other at St. Katherine's church, Leadenhall (see pics) and one in Golden Jubilee Hospital, Clydebank. I believe there's another one in France somewhere. The viewing bridge on the stern looks to be a later addition, possibly for cruising duties. I am building up the best visual records that is now possible of her, so if anyone is interested please get in touch.
Thanks
Alex