Putting aside a biting inflationary crisis and doubts over the monarchy’s future, Britons are set to party this week to mark a record-breaking 70 years on the throne for Queen Elizabeth II. The Platinum Jubilee offers a four-day respite from a surge in prices not seen since the 1970s, with accounts emerging daily of people struggling to put food on the table and clothe their children. With two public holidays from Thursday and then the weekend, pubs, restaurants and retailers are hoping for a timely sales boost, after a difficult period including the Covid pandemic. “With the sun set to shine …