The range is 20 to 35 based on this.
BT are only quoting a minimum of 14mbps for switching but vodaphone are promising 20mbps on the new line so at least I know I'm getting no worse if I take the new line.
Here is my speedtest results: Here
Your dsl router is connected at 22Meg sync - what are your router full stats?
PN FTTC 80/20 since 2014