Im fairly lucky with LPG around here, plenty of Fill Up places not that far from Hone or on my routes in and out of London or a few mins off the M25 -
Morrisons 2 near around 54p, Sainsburys 55p, 2 Shells that seem to complete 53 and 55p, untill recently a BP (MRH) was at 54p, but just up 59p now, still cheap if you use the MRH 10p off per litre Card thing, tend to carry 2 Cards now and switch between them, use the first 1- 5p discount for 30L tops ups and then use the 6 -10p for full refills, sounds like a lot of fuffing around but doing the Maths can bring it down a 48p Average over fill ups.
LPG has never been cheaper when compared Petrol or Disel these days, less than half price, its a no brainer for me.