The London Magazine is a UK-based literary magazine in print and online; they accept fiction, non-fiction, and poetry. They charge a fee for general unsolicited submissions, and also have fee-free submission periods which are listed on their guidelines page (they open at the beginning of each listed month and close when the cap is reached). Their editor has recently issued a pitch call for essays: “The London Mag is inviting pitches for essays, reviews and interviews that explore literature in its many intersections with culture, politics and the personal.” There is no submission fee for these essays. Rates for print non-fiction start at £150. See the pitch call/thread here.