Good luck with that
I'm rarely seeing more than 20mbps download, despite estimates being north of 50! That's what I get for living in Manchester, I guess - heavily congested exchanges
The Technicolor is a great ADSL modem router, but I'm not sure I'd want it on fibre - it should work, but I doubt it'll be anything to shout about speed-wise (and you only get 3 LAN ports because they've repurposed one of them for the WAN link). When I went plusnet fibre they were still doing nice Netgear boxes for vDSL customers. It's probably worth seeing how you get on with it, but I'd definitely consider putting some cash aside for a new router...