I am bracing myself for my fibre turn-on today, and going by all the posts regarding the HG633, I'm not very optimistic, but I am a pessimist! 
I will do my best to get the HG633 up and running to as good it I can possibly get it, and also request a 1.21t firmware update along the way, but long-term, I will probably end up using my previous Netgear router and then use the HG633 as fall-back.
I refer to this link on setup of non TalkTalk routers
Are there any other router options in addition to the settings mentioned in the link that I need to change to get it working properly on a D7800?
I was wondering if there is anyone on here who has configured a D7800 (or very close to this model) to work on TalkTalk fibre?
Also, what are your thoughts on comparing this router with the HG633? Do you see any advantages to perservering with the HG633 over the D7800?
Many thanks
Paul