On Wednesday, 28 August 2019 14:47:12 UTC+1, Andrew wrote:
My garage is not joined to the house, a metre wide path
separates it.

At the moment power to the garage is via a 13 amp
plug-in socket inside the house, with a short length
of 16 amp flexible core which goes into a back box
containing a choc bloc connector where it joins
some 2.5 t&e that goes through the wall, under the
path (inside a piece of gas pipe !!) and into
the garage.

Originally it was just a spur off the single house ring main
(1976 build) and done before I came here, including the use
of gas pipe as a conduit. In fact even the main EDF incomer
enters the house under the front door inside some yellow
gas pipe, along the top of the slab next to the party wall
and up into the wylex meter box. Only 4 inches of screed
'protected' this cable. Obviously done by a professional
SEEboard electrician.

I have added the 13 amp plug so that the gge is now a
'portable appliance'.

If I proceed with the EDF car tarriff and their £299 charger
what sort of cable would this require ?.

The CU is about 10 metres from the point where the charger
could be fitted. Maybe 12 at most.

The cable would come through the void above the lounge ceiling
through the cavity wall, down the outside of the house, under the
path and up into the garage. I guess this would mean SWA but does
that mean an additional box is needed next to the CU to terminate
the SWA with a gland ?. Or do modern metal CU's accomodate a
cable termination like this ?.

I might as well use this to provide garage power and light too
but at some point someone will demolish the garage because that
would allow space for a 2-story 12 metre by 2.5 metre side
extension, so an economic solution might be better.

You might want to consider economy seven and a timer on your charger.
Then you could charge up overnight on cheap electricity which I do when PV power is low.

Take care, if you have economy seven, they put day price of electricity.
You need to do some calculations. Including what else you could do by night..