Home Hub 4 won't work with Infinity unless you have a separate Openreach modem. You should be sent a HH5 which will arrive in the post a few days before your activation date.
Cool, thanks for that - I thought something like that would be the case... Just surprised that the order doesn't actually mention sending the hub (I remember the order for BT Unlimited Broadband did). Guess I just have to hope that it all goes to plan!
infinity may well be self install and you will not get an engineer visit with hh5 it is just plug and play