London89
I have been reading your story on the other thread and I'm sorry you are going through a hard time at present.
Regarding the circumstances of what you have described, as you were in a collision in your car and required medical treatment, the police should not request a breath sample from the roadside nor should they take you to police custody straight away.
The police should follow the hospital procedure, where you are taken to A&E and the hospital doctor in charge of you on admission authorises the police to take a blood sample, then you have to agree to provide a blood sample.
If you refuse this request for blood in the hospital, the police can still charge you with failing to provide. The paramedic was correct in their guidance at the roadside that you don't provide anything (breath or blood) until you have arrived at hospital.
However, once in A&E their responsibility for you ends when you have been through triage and have been formally admitted by a nurse. Unfortunately, paramedics are waiting with their patients for hours now in A&E queues because hospitals are so busy and there are no beds.
I take it the said paramedic was still responsible for you in A&E because of the long wait?
CJ