There's ukulele wednesday's at the Royal George in London. Been down before and they're a lovely lot. Should be joining myself in Septmeber when I move down to London.
where abouts in essex ? we have the Bishops stortford ukulele society (Bsus) which is in herts, but not far from stansted which is essex, or maybe that is to far for you we meet every monday evening in a function room in a pub