Apparently, the airline says the halt is only temporary and it will resume flights on 30th March and passengers will be re-protected via LATAM’s daily Sao Paulo - London Heathrow route or via Madrid using partner Iberia.
The TTG reports the airline blames UK regulators for the suspension of the route as they require only aircraft from the carrier's Peruvian fleet. The service is usually operated by a Boeing 787 Dreamliner aircraft in a two-class configuration, with 30 business class and 217 economy seats.