Everyone in this country has a legal right to refuse ressus.
this is from the government website.
When a person's heart and breathing stops it's sometimes possible to restart the heart using cardiopulmonary resuscitation (CPR). Recovery after CPR varies and the patient may not regain their previous level of physical or mental health. If you don't want CPR you can refuse it and your wishes must be followed.
Resuscitation and your right to refuse it : Directgov - Health and well-being