I just got sky fibre installed 4 days ago and I sync at the same rates (cab is 12 houses away!) but I can not peak the download higher than 22Mbit... Upload seems to top out at 8Mbit.
Your line data shows that wholesale/openreach believe you should get close to 80megabit download and 20megabit upload sync at your location. Since you've purchased Sky Fibre, and not Sky Fibre Pro, you are limited to 40megabit / 10megabit speeds.
However you should get those easily, your router claims the fibre is synced at those speeds:
Broadband Link Downstream Upstream
Connection Speed 39998 kbps 9995 kbps
Line Attenuation 19.9 dB 0.0 dB
Noise Margin 19.6 dB 11.11 dB
What speed testing sites are you using, cable or WiFi to the sky Hub, and many security products can slow down the connection. 8megabit on a speed test site might be all you can get with a 9.9megabit sync due to overheads. You should get closer to 36 or 37 on the download however. (And you could go faster for an extra £10/month).
James BT Infinity 2 19/09/2012 - Sold 42/6 - Getting 49/8.5 - Sync 53 / 9.5 Mbps @ 470m approx
14 years of broadband (ntl: cable to BT FTTC) - Router: Asus RT-N66U - Modem: Huawei HG612 speedtest