Germanshepherdsmum
If your friend has given you power of attorney you can’t make any health or welfare decisions for her whilst she is fully compos mentis. As regards any other matter, you can only act with your friend’s consent, once the LPA has been registered, as long as she retains mental capacity.
I thought there was a section germanshepherdsmum where the person concerned could choose for their appointee to make decisions on their behalf before then with their agreement.
I am sure my Mum wanted this before she lost capacity. She said she was just so tired, she trusted me and knew what she wanted as we often discussed it.