No bother, went down a bit of a rabbit hole,
On the 6th of June 5th btn Black Watch went ashore at 'Frey-sur-mer' at 20:30
On the morning of the 11th, when your gt grandfather was killed, they'd been tasked with capturing Breville but met heavy resistance and suffered heavy casualties before withdrawing.
https://www.pegasusarchive.org/normandy/war_5BlackWatch.htm
I think "Frey-sur-mer" is a D-day typo for "Graye-sur-mer" - Juno Beach.
80 years ago right now your gt grandfather was at sea and around 8 hours away from landing
RIP Robert.