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Rather than selecting London to Lima on ba.com use the multi city booking tab. Obviously be aware of minimum connecting times.
I tend to book two separate flights. LHR to EZE via BA and then EZE-SCL with LAN. For Peru, I’d go LHR-GRU with BA, and then GRU-Peru with LAN rather than TAM. TAM’s OK, but LAN is better.
For some reason it’s often cheaper to book two separate flights rather than one. And no problem with checking luggage all the way through as LAN and TAM are OneWorld members. Only danger is someone sodding up a connection.