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Binary systems containing high mass stars evolve through a number of stages, and in many cases can appear as a black hole or neutron star orbiting at a large distance from a ‘normal’ companion star. This is a very long-lived condition which accounts for the vast majority of the millions of binary systems harbouring neutron stars and black holes in our Galaxy. Self-lensing occurs when the binary system is viewed edge-on such that optical light from the companion star is bent towards us and magnified. In the case of microlensing this is a one-off event, whilst self-lensing repeats on the orbital period of the binary.