In reply to robw007: Rob, I have done the PB with limited support (one friend running the last Snowdon section with me) - though I failed on a pure solo attempt getting from Llanberis to Aber Glaslyn. I like the Llanberis start staying at the Victoria legacy and starting early 3-4AM. For a pure solo just drive round the afternoon/ evening before laying down your food/ drink near the change overs (sheep/ people didn't "snaffle" these dumps), then just run... for a two day round maybe start at Llanberis and stop at the end of Day 1 at the PYG Hotel dropping off after Moel Siabod; for a three day round stay in Beddgelert?
Its an awesome round however you do it; but in winter - totally hard core and respect to Iain.
Enjoy,