Steph. Here is a photo of ORP Piorun being prepared for the Normandy landings. The censor has scratched out the ships number.
Here is a link to a part of the ships war record.http://uboat.net/allies/warships/ship/5423.html
Great memories. We owe much to servicemen like your father.
I particularly liked the anecdote about Piorun attacking the Bismark: Just when he was about to open fire, the Captain of Piorun signalled the Bismark 'I AM A POLE