I was thinking you would be served well by something along the lines of a DGND3700v1 with the aftermarket firmware from
http://www.richud.com/wiki/DGND3700_V1_Transmission_Firmware. That's what I am using at the moment and it's just excellent.
http://www.richud.com/wiki/DGND3700_V1_Transmission_Firmware#VDSL2_.28FTTC.29 so it supports VDSL2 FTTC fibre from all UK providers including BT Infinity so you should be good to go. In terms of wireless speeds it has simultaneous dual band (300mbps on each band) so that should be plenty fast.
The hardware is also quite strong: 5 gigabit ports, 2 USB ports, dual core Broadcom CPU and chipset etc.
More interesting is the firmware which provides some crazy functionality
like torrenting facilities (you can configure the router from a web interface to make it download torrents by itself to the USB drive then those torrents and other files can be accessed from any other PC), ad blocking, OpenVPN functionality, SSH and other services, PXE booting from the inserted USB drive (so you could boot up Windows, Linux distros, MemTest from any network connected PC) as well as having a ton of options for xDSL line control and extensive line parameters adjustments (for example, you can adjust the target SNR margin in 10% increments as well as other parameters easily).
Found a good listing on fleabay for a DGND3700v1 which has already been flashed with the latest version of this firmware here (
http://www.ebay.co.uk/itm/182292777747) so you don't risk bricking it by converting it from stock to modified firmware yourself.
Let me know if you need more info about this setup, since I have it and I am very, very happy with the performance.