Ford Kuga PHEV - Home Charging

Hi all, i've just had delivery of my Ford Kuga PHEV and it's been delivered with a 3 pin charger.

Is it safe to use an existing socket to charge this (located in my porch on a ring with downstairs sockets), or do I need to get someone to fit an external socket going direct to the fuse box?

I'm not in a position to install a fast charger at the moment!

Any help much appreciated! Thanks