Adapting existing outdoor power supplies

My house has external power into the garden fitted by the previous owner.

Currently there is street light (one of those 3 bulb types) which is connected via SWA, and straight into a 13a fused switch spurred from a socket.

The other is a water pump for a water feature which is connected via SWA which then enters the house as 3 core mains cable on a plug beside a socket.

Presuming both are suitable (the first being fused and the second being an elaborate extension lead) I am hoping to make use of these in an adjusted setup.

1.
I've wired in 10 LEDs into a deck which are 0.5w each, and I plan to add a water feature in the future, which will use a simple pump.

I had planned on using the current water feature install to attach a IP66 twin socket to it, so I can then plug the water feature and lights into it. I guess alternatively, they could both be joined via a junction box, but then it takes away the option of having one or the other? It also gives me a potential power source for any other low powered items (laptop charger for example).

2
The cable to the street light is only long enough to site it where it currently is, some 2-3 metres from the house. I would like to re-site this around 8-9 metres away. Will I need new cable or can the SWA be joined successfully?