You might love the tube, but there's no way you know half, or quarter or one hundredth as much about it as our resident tube nut Geoff Marshall.
So here's the deal: buy Geoff's Secrets of the Underground DVD — quite possibly the best DVD ever made about the tube — and not only will it keep you entertained for hours, it'll top up your noggin with tons of tasty tube trivia.
And here's the other deal: buy Geoff's Secrets of the Underground DVD this weekend and you'll get 20% off. That's £11.99 instead of the usual £14.99.
But mind the (price) gap! The offer only runs until Monday (26 October) at 1oam.
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