"This guilty plea comes following a comprehensive police investigation and we're grateful to Peter's family for their support while that process took place, and the kind words they have said publicly.
"We also wish to thank those people who provided us with information in the early hours of our investigation that linked Christopher Monro to this crime.
"That crucial detail enabled us to work quickly and effectively with our counterparts at Thames Valley Police to ensure Monro was apprehended at the earliest opportunity."