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LPG is synthesised by refining petroleum or 'wet' natural gas; it was first produced in 1910 by Dr. Walter Snelling, and the first commercial products appeared in 1912. It currently provides about 3% of the energy consumed.
Depends where you get it from. Up here in Yarksheer, Morrisons have a blanket price of 54.9p and that hasn't changed since Christmas. Shell stations vary from 49.9 to 53.9 (Barnsdale Bar services A1 Northbound). Tesco's Express in Rothwell are 47.9, but my local in Harrogate is 67.9 - don't use it at all. Crown Point Jet station in Leeds is 52.9 and I pop in there on my way back from Costco