Well it went live bang on 1pm and using the O2 Wireless Box II they issued results are slightly better than Sky.
Bandwidth (Up/Down) [kbps/kbps]:1,321 / 11,673
So almost double the upload speed and roughly 1mbps higher on the download speed and I'm only paying £7.50 per month, nice!
I have to say O2 have kept me informed at every stage by email and sms message, even texting me to say I'd been switched and could now connect my O2 router!
Update:
Flashed the old Sky Netgear Router with the latest DGTeam firmware and I'm now synching at..
DownStream Connection Speed 13467 kbps
UpStream Connection Speed 1308 kbps
So thats almost increased down speed by almost 2mbps.