White Peacock in Buckinghamshire

Hello, I captured on CCTV a white peacock wondering around the grounds. There are no neighbouring properties with peacocks and it is a mystery, can they roam wild?

Photo

https://drive.google.com/file/d/1buA6cpnWJtImsXbGzNg4Yg-G_rpBAgIP/view?usp=sharing

Video

drive.google.com/.../view