William Hill 's Kate Miller said : ' We 're the leading bookmaker .
William Hill 's Kate Miller had a scanned copy of the 1 - 5 odds - on betting slip supplied by the company 's trading chief on her laptop .
William Hill 's Kate Miller , who had a scanned copy of the 1 - 5 odds - on betting slip supplied by the company 's trading chief on her laptop , said : ' We 're the leading bookmaker .