I experienced the same "push back" at the scenario stage of the recruitment process. The HR person played the part of an extremely difficult and awkward employee. To your point no matter which way I approached the situation the HR acting / in the role play refused to come around and there was not enough time to complete the exercise. What are SKY playing at??? I would suggest a senior member of the management team arrive in unannounced to see and observe one of these session and see if there is an issue here with a lose cannon in HR!