Removing the VLAN ticket seems to have fixed the issue, the MR600 is connecting through VDSL ok now. Thanks for your help

I'm posting this again as not sure what happened with my original post 3G/4G connections are working very well on the router and I've configure the wireless router mode on the MR600 so that it uses...

I've configured the wireless router mode to use my ISP (BT) but unable to connect These are the steps I've taken BT Modem connected to phone line and connected LAN cable from this to the tplink WAN...