The discovery that massive galaxies in the early Universe were much more compact than in the present day raises important questions for our understanding of galaxy evolution. How many of these compact systems survive today, and what has been the fate of the rest? Up until now, the distance of these objects from us and their intrinsic smallness have conspired to make them extremely difficult to characterise in any detail. I present a new class of strong gravitational lens – the EELs – in which an ETG is lensed by an ETG, and show that the source galaxy population is dominated by z ~ 0.6 compact galaxies. I exploit the magnifying effect of lensing to model these galaxies to unprecedented resolution and so characterise their morphologies and place them on the size-mass relation and the fundamental plane. This gives us new and exciting insights into the compact galaxy population and helps us to tighten constraints on their evolution.