DH and I were walking through the grounds of Windsor Great Park last year to Windsor Castle - not knowing it was the day of the Order of the Garter ceremony. We came to an open gate on part of the walk and a car was coming towards us, we stood to one side, and as it went by saw it was Andrew dressed in a collar and tie. When we got closer to the Castle, there were loads of people in formal clothes walking in to the Castle grounds for the ceremony.
My point being that although it is in Windsor Great Park, Royal Lodge is not one of the properties in the main security corden, and the residents need to drive past the likes of DH and me to get anywhere. Thus the need for expensive security.
A pedophile is someone interested in prepubescent children not in 16/17 year old girls.