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/cms/?Historyhttp://www.rnpsa.co.uk/cms/?History
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
BBC on RNPS: http://www.bbc.co.uk/history/ww2peopleswar/stories/25/a8796225.shtml
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.
More information about Admiralty Trawlers and Hired Trawlers can be found at https://www.naval-history.net/WW1NavyBritishShips-Dittmar4AP.htm#hired
Scarborough vessels included:
PENGUIN II, fishing trawler. Built 1895, 151grt, Scarborough-reg SH.223. Requisitioned by Admiralty in 1917 for Fishery Reserve, commissioned and flew white ensign; continued commercial fishing under naval control.
ROSY MORN, hired trawler, Adty No 2770. Built 1914, 181grt, Scarborough-reg SH.59. Armament: 1-6pdr. In service 5.15-1.16. Mined 13.1.16 near Dogger Bank.