Some folk are truly taking the mick on road LPG pricing, I did a 500 mile round trip Bath > Lowestoft > Bath last Thursday and had a chance to compare prices as I went...

Later, I found an 87.6p/litre supposed price on line but couldn't locate the offending garage.
All Shell + BP ( 5 visited / logged ) have 85.5p and compared to the supermarkets (where one assumes a minimal markup) - that's a
22% spread which seems extraordinary. The pricing didn't follow a regional pattern. The spread on the non supermarkets, non BP-Shell was 74p to 78p per litre. Off motorway sites were as likely to charge the higher price...
This is simply not reflected in most online resources... BP in particular have history of being caught doing the propane predatory price fixing thing - the Yanks fined one of their directors US$250K IIRC.
Are Shell / BP trying it on - and taking a cue from pirate welly sellers at a wet Glastonbury?
Are they testing the market to see what the supply/demand economics thingy does?
At what point do customers get provoked to start putting the fuel in bottles with flaming rags in the top? If they try this with "normal fuel" Cairo won't be the only place where things kick off.
The issue with the utilities is that we all know that what they supply is a highly consistent quality controlled product (legally controlled quality in many cases too) and that the "tariff hell" and bungled (or speculative) billing is part of the subterfuge that they employ to wind extra margin from the users.
People are getting very annoyed with this.
The introduction of smart meters into electricity retail is going to make mobile phone contracts look like models of transparency and honesty.... Although allowing a broker like ahem...
Google to select the lowest tariff automagically via the interweb might put a spanner in the works :-) (think telephone least cost routing)
This meddling and cheating has to be addressed.