I'm struggling to get much of it done, and yet with it being dark at around 5pm there ought to be plenty of opportunities. The problem is, as ever, the lack of suitable places to land - I'd estimate that about 70% of GA facilities shut up shop as the sun goes down, a further 25% become unavailable an hour or two after that, leaving just a couple of places in the entire country that are both available to GA at say 10pm and that don't require a small mortgage to pay the fees (I can think of, erm Southend and err...)
There's an obscure rule that prevents licensed airfields from installing pilot-controlled lights, and even when a licensed airfield becomes unlicensed when closed, pilot-controlled lighting is still not allowed. Even it it were, I doubt that many would oblige and fit the necessary, relatively low-cost equipment - night flying habits just haven't developed enough to make it worthwhile.
It's a shame, and it's one of the two things that significantly reduce the utility of GA in the UK, the other being the lack of instrument approaches at smaller airfields.
Perhaps one day…