Took both doors off. Took rear window and one rear quarter window out. The rubber seal for the back window had almost completely disintegrated so the glass just lifted out. One quarter window was seperated from its tracks (a plastic roller has fallen off) so this was also simple – the other side is still connected to the guide tracks, so I’ll leave it for now.
Don’t do this to the rear window, have stored it somewhere with less chance of it breaking: