Hi MrFibro
You can apply for PCG at the same time as your state pension, if you are already getting your state pension you can ask for PCG to be backdate.
If you receive the daily living component of PIP and no one claims a care element for helping you then you will be entitled to a SDP premium worth £81.50 pw.
The way PCG is worked out, you get a basic amount £218.15 + any premiums (SDP) £81.50, total = £299.65 pw and then you take away any income you have coming in such as state pension, any private or company pensions or work (benefits are ignored).
Gary
Nothing on this board constitutes legal advice - always consult a professional about specific problems 
