This one is going to be a pain. The electrician that put the old one up used it as the linking point to daisy chain the wiring. But modern LED ones just assume a point wire to the light and either give you a wired light or a connection point that won't act for daisy chaining
But for £13 delivered who could really complain? Well me obvs but one IP65 junction box bought and I'm all ready to go if only I could find the enthusiasm.