If you've got lights on a timeswitch in your house, you'll know that - as the nights draw in - you need to keep changing that timeswitch to make sure you don't end up in the dark.
Well, it's the same for St Paul's Cathedral.
Every year in mid-October I ring up the good people at the Corporation of London and remind them that it's getting darker earlier, and that London Tonight viewers can't see St Pauls.
If you've watched the programme in the last couple of nights, you'll know it's now very dark by about 6.15pm - and you can't see much behind our presenters. In fact it's pitch black. Well, I've made the call. Now we wait.. and if you know anyone with a very bright torch, drop me a line.
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This is the official website of London Tonight, on ITV1 in London and the South East every weeknight at 6pm.