I think if the wording is legible there should be no problem.
I have yet to be convinced that there is much point in giving a LPA
(lasting power of attorney) or a living will.
My father, always keen to plan ahead, completed and filed a LPA which
meant that several of us were attorneys who could make decisions for him
if he became unable to make the decisions for himself. He did this at
least 10 years before he eventually died. But how would we ever have
decided that he was no longer of sound mind? If the decisions of the
attorneys had to be unanimous, how would we have reached agreement? If
they didn't have to be unanimous, whose wishes would have taken
precedence? I think what often happens is that the wife is, of all the
attorneys, the most reluctant to give up hope and to let go.
In a way, the LPA did come in useful, in a rather silly way. Eventually
my father was unconscious, at home and close to death. He seemed to be
having difficulty breathing but no medic had yet told us that the end
was nigh. His wife called NHS111 who in turn summoned an ambulance and
while we waited for the ambulance the call handler gave daft advice
about putting him in the recovery position - well, she wasn't to know.
The ambulance arrived and the amazingly nice paramedics examined the
patient and took a history from us. They tried to ring our GP surgery,
as usual there was no reply and they said this is typical of GP
surgeries nowadays. They said one option would be to take the patient to
hospital but he might die on the way, or else he might die on a trolley
while waiting to be seen. They said it wouldn't be appropriate to take
him to hospital and then, one of them asked hopefully if there was a LPA
in force. Yes, said his wife. That's good, said the ambulance man, no
need to show it to us, you have the power to make decisions so we'll
agree that we won't take him to hospital and we'll try to get the GP to
send someone to visit the patient.
The wife (now widow) believes that if there hadn't been a LPA her
husband would have made that futile and cruel journey to hospital by
ambulance but I don't believe it.