Genealogy / ORP Błyskawica Crew Records? [46]

Hello,
i'm new to the Forum and have an interest in ORP Blyskawica.

On 30 Nov 1939 the Blyskawica was escorting a convoy from London northbound to Newcastle.
The 'Commodores Ship' SS Sheaf Crest hit a german mine in the Thames eastury and sank.
Blyskawica picked up 25 survivors.

I believe my paternal grandfather, Leading Signalman, Robert Lumsdon, RN was among those survivors.
I think Robert was taken onboard alive, was taken to shore - maybe Harwich, and died the next day.

Robert is buried in a war cemetary at Shotley, Suffolk, UK.
His gravestone says he died on 01 Dec 1939, aged 27.

I have just finished 22 years service in the British Army and now want to find more about Robert my Grandfather.
I am travelling to Gdynia on Fri 25 Mar for the weekend and will visit Blyskawica to pay my respects.

It would be too much to hope to meet one of the Blyskawica crew who was onboard that night,
maybe I have come on this search too late - but my family never talked of Robert - I have only recently found this information.

Kind Regards

Graham Lumsdon