Sparky types... your advice please.

I have one measly (double) plug in my garage.

It is in a daft place too. Offset an the back of the garage. Can I spur off it in both directions? One going one way, one going another?

And then spur off the next one?

This is my rubbish technical drawing. The black is the existing. The red is what I want to do - assuming that it is safe and legal.

Thanks in advance.