My friend's Mum was a bookmaker and I used to help her on busy weekends, Grand National days, Derby days etc etc. Back then, early 70s, you were not allowed to have a window that people outside could look in. Neither were you allowed a TV. Of course we used to have a TV in the office, and MANY a time, the policeman would pop down and say "come on Mrs W, switch it off"! So we'd switch it off, then straight back n again when he left. We also used the old "clocks". These were leather pouches which the pubs would use. The bets would be collected along with the stake money and places in the pouch. Then it was locked and timed, so that nobody could slip in a winning bet after the race had been run. These were also illegal. Bank holidays were particularly risky as we didn't know what was happening at the "off" meetings i.e. the meetings at the smaller racecourses which were not getting TV coverage. If there was a bet "running up" it was impossible to get the opportunity to "lay it off". We only got the results of those meetings via the XL system which was a telephone earpiece on the desk which was linked to Liverpool. They would reel of the results and yiu had to listen carefully! My, all that has taken me back.