According German Kriegsmarine reports, Vorpostenboot V2003 next to her sinking suffered 21 missing sailors indeed. See
https://catalog.archives.gov/id/3393...objectPage=372
Names of missing here:
https://catalog.archives.gov/id/3393...objectPage=394
No Günter Schwarz among them (Günther Schütte?)
Confrontation with British M.T.Bs was off Terschelling, also a bit far from Shoreham...
Leendert