I want to run a new power supply to my garage which is about two metres from my house. The current supply is basically spurred from the kitchen ring, through the wall and then on to the garage via a catenary wire. The most it supplies is a freezer, a light and power hand tools. However, I have recently done away with my electric shower so now have a 30A supply going spare, (although it will be de-rated to 16A) which I would now like to use to feed the garage. The consumer unit is in a cupboard inside the house but mounted on an outside wall. I can thus take the new supply cable straight through the wall. However, I then need to get the cable to the garage which is probably 10 metres from the point where it comes through the wall. Burying the cable is not an option due to the type of drive and obstacles such as drains and steps. Therefore it will need to be clipped to the outside wall at a height of around 300mm and then run via a new catenary to the garage. The reason for the low run is that the house is predominantly pebble dashed with a 300mm bare brick skirt below this and I would rather clip to a flat solid surface than the potentially damaging and less stable pebble dash. My question is, what cable should I be using for this and should I be using conduit? Is there anything else I need to know? Thanks.