If the history and career of the ON-family wasn't so tied up with the history of the Netherlands, they would not have been able to amass such an incredible amount of jewellery.
With regard to the openness of the British RF: they were under huge pressure to stop leaning on the British taxpayer so much and were pressurized into cultural entrepreneurship at a certain point. I do believe this is the main reason for opening BuckPal and working with the Royal Collection to present exhibitions people love to visit. And they are doing a splendid job.