From the Health and Safety Executives submission to the Taylor enquiry.
."6.105 The HSE also found that had the central pens, 3 and 4, conformed to the Green Guide, their maximum capacities would have been 1,015 and 1,036 respectively. As they did not conform, their maximum safe capacities should have been 822 (pen 3) and 872 (pen 4). Yet the safety certificate allowed 1,200 (pen 3) and 1,000 (pen 4).
2.6.106 The HSE estimated that on the day of the disaster 1,576 people entered pen 3. This was approximately double the maximum safe capacity.
61 The HSE found no evidence that this was due to fans without tickets entering the ground. It calculated that the highest number of entrants, either through the turnstiles or Gate C, was 10,124, just 24 over the designated capacity of the Leppings Lane terrace."