hms grampus is not a "grampus class"but a "porpois class" submarine.my wifes grandfather went down on hms grampus and as up to now we still havnt got a photo of him even though hms dolphine were very helpfull.we have quite a bit of info on grampus if you wish to obtain it please contact me,we might be of mutual help
yours aye m h glynn(nee katherine hedley/p o stoker hedley)