Don’t get me wrong.  I love autumn.  In fact, it’s probably my favourite time of year.  But the combination of the clocks going back and stupidly long hours spent in the office have left me in need of a little pick-me-up.  And pick-me-ups don’t get much littler than Tang.  Not because it didn’t have the desired effect, but because it is genuinely tiny.  This weeny Chinese restaurant is hidden away in one of those strangely unpalatable parts of the West End, just off Tottenham Court Road, and you’ll definitely need to keep your eyes peeled to find it.  It’s worth wandering up and down the tourist-choked streets of WC1, however, because Tang is a hidden…