Sophie may well be 8-1 on to walk, but last Tuesday, Alex was 3-1 on and by Thursday all bets on Spencer were off! He was even bigger favourite to walk against Alison but, again, it all changed as big bets were placed. Obviously betting syndicates cannot make up big gaps of say, 6-700,000 votes, but with smaller votes, they can place a large bet on Jonny walking (at say 5-1) then organise mass phoning in to do it. I'm sure that played a role with Alison's and Spencer's evictions.