Residual Current Devices, (RCD’s). An RCD is an automatic safety device intended to provide extra protection against electric shock. The national safety standard BS7671: 2001 (formerly known as The IEE Wiring Regulations) has for some years required that any socket outlet that may be used to supply portable electrical equipment outdoors, such as lawn mowers or hedge trimmers, to be protected by an RCD with a rated tripping current not exceeding 30mA. (Regulation No. 471-16-01).
Old style connectors are no longer acceptable, these will need to be replaced or cable routes rewired.
Note also the unsheathed earth cable - this also is unacceptable.