Welcome to TP.
Has Mum had a Social Services assessment for care needs yet, or your Dad had a Carers Assessment? Dad should telephone his Local Authority Adult Social Care and ask for some help.
Or there is the local support group:
Matlock Carers Support Group
Description: 1st Monday of each month, 2.00pm-4.00pm at Matlock Town FC, 1 Causeway Lane, Matlock, DE4 3AR. A monthly group giving carers the opportunity to discuss issues affecting them.
Area served: Open to all
Target group(s): Carers of people with dementia of all ages
Telephone: 01332 208845
Email:
derbyshire@alzheimers.org.uk
I'm sure he will find help and support there. I googled Alzheimer Society Matlock and this came up but there are other support groups in Derbyshire if this one does not suit.
Good Luck