I don\'t think it\'s a mistake.
Last I was in England - many years ago - there was not W-P-S betting, only win & place, with \"place\" being anywhere in the first 3 or (I think) 4 finishers, depending upon how many starters were in the race.
Typical bet would be X to be bet \"both ways\", meaning the total bet was 2X and the bets were - in our understanding - for win and for show.
Bob