First brewed in 2002, Number 7 is the baby of the family, though to call it 'cooking bitter' would be to understate it's delicious and delicate hoppy flavour and refreshing bitterness.
I used to like saying "a man (ok, person) only needs two beers: one he can drink all night and one he can't". This is the former, though obviously I don't advocate you have any more than the government thinks you should.
And really, it's no baby. That would suggest it's a young and fresh style, gurgling and bubbling with youth. No, it really is an old man of an ale, zimmer frame and all. But I like it - I'm comforted by it's old fashionedness and understated Kent hoppiness and gentle malt character.