| Name: | P 20 |
| Type: | Patrol Boat |
| Keel: | |
| Launched: | 03/04/1916 |
| Completed: | 1916 |
| Builder: | Northumberland Shipbuilding Co Ltd |
| Yard: | Howdon |
| Yard Number: | 237 |
| Dimensions: | 613disp, 230.0 x 23.75 x 8.0(draft)ft |
| Engines: | 2 x Steam turbines, 3500ihp |
| Engines by: | |
| Propulsion: | 2 x Screws, 20.0knots |
| Construction: | Steel |
| Armament: | 1 x 4.0ins, 1 x 2pdr QF guns; 2 x 14.0ins torpedoes |
| History: | |
| 1916 | British Royal Navy |
| 05/1923 | Broken up |
| Comments: | Member of the P Class of patrol boats or sloops |
| 05/1923: Broken up by Richardson Westgarth, Saltash |
Above photo is of typical P Class Patrol Boat
Above photo is of typical P Class Patrol Boat