Schedules are changing hourly (mostly for the worse) and limits on who may travel where are changing as well.
I would sit down right now and look at all possible routings LIM - UK. Presuming that you are a UK national and do not fit any of the exemptions for the US and Canada, just skip those connections. As others note, Brazil still appears to be open, but do not plan on that being the case for long. If you find something, do not hesitate, book it and head for the airport.