Okay so I tried to tether this morning and wham bam straight away it worked. Got speed of 35mbps from Lebara so well chuffed with that it's a big improvement on 8mbps adsl2+.
I would guess that with a dedicated 4g router the speed could even get a bit better maybe up to 40mbps.
What I did notice is I could not access some site that I normally visit on my laptop, torrent sites and pirate bay not loading :-(
Any idea wha'ts causing this fellas?
Type "pirate bay mirror sites" into Google and try the links that come up