The NHS has been gutted by successive conservative governments. It's a shadow of it's former self and not really a health service at this point. This type of crime could happen anywhere but a lack of funding would surely also contribute to a lack of oversight.
I don’t know why you are being downvoted. You’re right. This is not just one evil person. It’s also a systemic failure of controls and oversight. This would not have been possible without a criminally negligent institution around the perpetrator.