More about HMS Prize.

The Mystery deepens. I checked this website
http://1914-1918.invisionzone.com/forums/index.php?showtopic=150876

And it gives the names of the crew who were lost when the Prize went down.
Here’s the full list

BRYANT, Sydney D, Deck Hand, RNR, DA 10534, Prize (ex-German Else), 13 August 1917, ship lost
CARPENTER, David J, Deck Hand, RNR, DA 2766, Prize (ex-German Else), 13 August 1917, ship lost
CHUDLEY, John C, Officer's Steward 2c, L 1943 (Dev), Prize (ex-German Else), 13 August 1917, ship lost
CLEMO, Charles R, Shipwright 2c, M 16543 (Dev), Prize (ex-German Else), 13 August 1917, ship lost
COLLINS, Thomas, Deck Hand, RNR, SD 2677, Prize (ex-German Else), 13 August 1917, ship lost
FERGUSON, James, Deck Hand, RNR, SD 1482, Prize (ex-German Else), 13 August 1917, ship lost
FISHER, Albert, Able Seaman, 232272 (Dev), Prize (ex-German Else), 13 August 1917, ship lost
HENSHALL, Henry T, Ordinary Telegraphist, J 48097 (Ch), Prize (ex-German Else), 13 August 1917, ship lost
INCH, John Lumsden Temp/Skipper RNR HMS Prize killed 14.8.17
JARRETT, George J, Petty Officer, 222863 (Dev), Prize (ex-German Else), 13 August 1917, ship lost
KING, Nicholas, Seaman, RNR, A 6829, Prize (ex-German Else), 13 August 1917, ship lost
LAKE, Frederick, Ty/Skipper, RNR, Prize (ex-German Else), 13 August 1917, ship lost
MANTHORPE, John J, Deck Hand, RNR, DA 2967, Prize (ex-German Else), 13 August 1917, ship lost
McDONALD, Kenneth N, Deck Hand, RNR, DA 14514, Prize (ex-German Else), 13 August 1917, ship lost
MILLER, Albert E, Telegraphist, J 25820 (Po), Prize (ex-German Else), 13 August 1917, ship lost
MORGAN, Benjamin L, Cook, RNR, TC 1003, Prize (ex-German Else), 13 August 1917, ship lost
PORTCH, Henry H, Ty/Lieutenant, RNVR, Prize (ex-German Else), 13 August 1917, ship lost
RAVEY, Thomas, Deck Hand, RNR, SD 2513, Prize (ex-German Else), 13 August 1917, ship lost
REVELL, Henry J, Deck Hand, RNR, DA 8061, Prize (ex-German Else), 13 August 1917, ship lost
SANDERS, William Edward (VC, DSO) Temp/Lt Cmdr RNR HMS Prize killed 14.8.17
STOBART, Walter P, Motor Mechanic, MB 1991, Prize (ex-German Else), 13 August 1917, ship lost
TARRAWAY, Robert, Petty Officer, 153498 (Dev), Prize (ex-German Else), 13 August 1917, ship lost
THACKER, Tom, Deck Hand, RNR, DA 8060, Prize (ex-German Else), 13 August 1917, ship lost
VINCENT, William H, Deck Hand, RNR, DA 681, Prize (ex-German Else), 13 August 1917, ship lost
WATSON, Harold L, Motor Mechanic, MB 1904, Prize (ex-German Else), 13 August 1917, ship lost
WILLIAMSON, Alexander, Deck Hand, RNR, DA 4819, Prize (ex-German Else), 13 August 1917, ship lost
WILSON, Gilbert J, Deck Hand, RNR, DA 15235, Prize (ex-German Else), 13 August 1917, ship lost

The post goes on to say that the men of HMS PRIZE are remembered on Panel 23 of the Plymouth War Memorial. The church at Milford Haven also preserves a memorial tablet to Lt Sanders VC and his crew. This is because many of the crew of the Prize were drawn from reservists from the Milford Haven area.

I’ve checked the on-line photos of Panels 20-27 on the Plymouth War Memorial and while it’s true that temp Lt/Commander Sanders’ name is there. I can’t find any record of the others.

However I was successful in finding the entry for Stoker 2c R Clemo, who as you recall, went down with the Tornado in December 1917.

As far as I can make out there were two Clemos lost in WW1, but only one entry on the War memorial.