@Philippa17
Hi - you currently have your pricing set for approx £45 stg per night - irrespective of the number of people staying there. I believe that is what you wanted to achieve.
You also have a monthly discount set at 10%.
You should consider beefing up your house rules and also putting place a security deposit, particularly as you say suitable for events (which to some will mean wild parties). You have a flexible cancellation policy - which is very generous for a full house - I would suggest changing it to moderate.
I would also suggest you need more photos - for example you only show one bedroom
AirBnB will offer price suggestions based on a number of factors - however you are free to ignore these and base the price on your experience of what price you can obtain.