Or am I better buying a combined Modem / router

@waseemadiga Thank you.. I guess I can't plug the TP3600 into the BT home hub? And just use the BT as a modem

I am trying to set up BE3600 to replace ISP provided BT home hub which plugs straight into 5C Master socket. I suspect.. The 3600 is not a modem so that is why it won't connect to Internet? Surely...