I've wired up the solar timeswitch in a more permanent fashion - a flex goes off to a 13A plug with a 5A fuse in, as it will only ever have a low-power light connected to it.
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The switched socket wasn't really necessary, as the timer can be manually operated, but it's not a good idea to rely on that, as the 'on time' might creep up on you. The indicator lamp seemed worthwhile, then you can quickly see that the circuit is powered, should the controlled lamp fail.
@Just little old me:) is to be credited for supplying the socket plate.
I still need to sort out the fixed pin for the off-time, it's not as simple as I had hoped, but the system would be usable now, although the light would stay on until an hour or two before dawn, rather than going off around the very early hours on a fixed basis - I'll get there at some point.