Many of Scarborough's mariners would have been recruited into the RNPS during WW1 & WW2. They mainly worked on minesweepers and many lives were lost.
There is a great deal of history on the RNPS website: http://www.rnpsa.co.uk/history.htm
Also on the Harry Tate's Navy website: http://www.harry-tates.org.uk/veteranscontents.htm
Wikipedia on RNPS: https://en.wikipedia.org/wiki/Royal_Naval_Patrol_Service
SPARROW (2) (ex-JOSEPHINE I), Admiralty trawler, minesweeper, Adty No 58. Built 1908 Goole SB, 266grt, purchased 4.09. Armament: 1-12pdr. One of six trawlers purchased pre-war as minesweeping training ships for men of the fishery reserve, later the Auxiliary Patrol. Based at Portsmouth 1914. On outbreak of war, allocated to the patrol organisation as minesweeper. Renamed JOSEPHINE I 1.20. Sold 5.20 as ORION.
Information about these vessels can be read at War Trawler