Our uniform is quite clearly distinct from the police, it has 'warden' on the back and I think it's quite obvious where we are coming from.

BBC: NEWS | UK | England | London | My London: 'We are the eyes and ears'

"It's quite obvious to me that there must be some individuals who are born with a more intense or less intense appetite than others and put in the right situation or the wrong situation - abundant access to food - those individuals born with greater appetite drive are much more likely to become obese, " says Professor O'Rahilly.

BBC: Born to be fat