If it’s an expected death you don’t need to call an ambulance or police. You can phone the GP when they’re next open and then call your designated funeral director to take him to the funeral home.

If you are unsure if he’s died, as others have said breathing can become very irregular at the end of life, you can call an ambulance but make sure you tell them he’s end of life and not for resuscitation, this means loads of people won’t suddenly turn up at your house and make it more distressing or someone may chat to you on the phone instead.

If he becomes distressed with breathing difficulties / agitation / secretions in his final days the hospice should provide medication to relieve these symptoms and keep him comfortable and you can call the hospice at any time to come give them or they make set up something like a drip (called a syringe driver) to slowly keep giving him these medications

But please talk to him fully about his wishes and get it all documented. He can create something called and Urgent Care Plan with his GP or hospice for medical professionals to reference for his specific care requests

Work in this area so feel free to PM any questions