Wholesale natural gas prices have risen by more than 40% this month as a raft of pressures, described by one analyst as a "perfect storm", threaten to raise energy bills ahead. Day-ahead prices for UK delivery were at a six-month high on Friday, a rise of more than 14% on the day, as contracts across Europe rose according to LSEG data. Europe has witnessed a price spike this year as cold weather and low gas storage levels combined with slowing deliveries of liquified natural gas (LNG), mainly