you either need a vdsl modem/router or you need an openreach modem and then a router modem/router are quite expensive and limited whereas getting an openreach modem form auction site and then router wouuld be a cheaper alternative
You could use your netgear as a wirless acces point by connecting it to the HH5 but it is a bit of an adhoc solution as you can not just use the HH5 as a modem only.
If you buy an Openreach modem from an auction site for about £20 you could use your Netgear with the Openreach modem.
If you would rather have a one box solution just do a search for VDSL modem/router and you will find a selection. If you stick to the well known brands you won't go wrong.
most popular is HG612 and unlocked if you want to be able to see the stats - unlocked probably more expensive
having router and modem allows you to reset your router without disrupting your infinity connection