Many thanks for the information Jerry - there are some keen divers just down the road from me and I'll ask them if they know anything about the Dornier.
Getting off topic but useful for my "diorama" is a colour photo of Howe as she would have been at the end of her refit in Devonport:
http://www.ww2incolor.com/britain/HM...al_1944&full=1
I'm sure there's a better version of the same photo somewhere else on the web. I believe she was repainted in Ceylon (Sri Lanka) on the way to join the BPF.