You can make a Subject Access Request (SAR) to your GP, but you will almost certainly have to pay a fee - £10 in the case of electronic records, or up to £60 if the records you want are held in paper form.
If your GP has your records online, you can see them free of charge.
You can access the records of a deceased person if you are a personal representative (the executor or administrator of the deceased person's estate) or someone who has a claim resulting from the death (this could be a relative or another person).
You must make the SAR request in writing to the deceased person's GP.
In all cases, access must be given within 60 days of the request.