Your Beach is equipped with 1 or 2 USB ports and 1 230v socket. The USB port and the socket can easily be found over the fridge. Alternatively, the socket can be under fridge, next to the floor. (see the photos below)
The USB Port can be used if you have enough power on the leisure battery but the 230v socket only works if the van is plugged into a mains supply.
Other relevant articles:
How to charge the leisure battery