jonb: That's fairly low predicted download speeds for VDSL. You would still get good upload speeds though - about 10 Mb/s, so maybe only worth changing if upload is important to you.
Thanks for that mate so you say these numbers won't change they told me they were just estimate. the telecom guy said he switched his and got:
adsl2+: 14.8 -15.5 Mb/s
VDSL2: 17.6-18.4 Mb/s
but once he got connected he got between 24-30mbps. I'm not sure if he's lying or not. But was wondering If I see no change can I go back to ADSL2? I'm sure there must be some sort of 30 day money back guarantee