29th July 2011 was quite a significant day in recent Watford history. We signed a left back. A bona fide, left footed, owned by us, defender. And whilst it's too early to pass any judgement on Carl Dickinson just yet, the early signs are encouraging. So why has it been so difficult to fill that slot in recent years? Some Hornets fans will tell you that we've not had a decent left back since Paul Robinson left for West Brom back in 2003. So I'll have a look at those “number 3s” that have come and gone over the years and see what went wrong.