As an expat the usual move is to shift your UK pension offshore in what is known as a QROPS. The recent changes has possibly made this less worthwhile. Frankly it is quite a difficult subject to grasp and good advice is really required.
I have started making enquiries as to the possibility of drawing down the full amount and the tax implications. If your pension,SIPP, is UK based I suspect you will have to pay tax.
If it is offshore well that is the question I am trying to find the answer too. (my pension is offshore).