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 my ISP (BT) via WAN but i'm unable to make a successful connection

These are the steps I've taken:

• Phone line connects to BT Modem and the BT modem then connects to the MR600 WAN port via network cable
• Configured MR600 to wireless router mode and started quick set up
• Enabled VLAN with VLAN ID of 101. Username - bthomehub@btinternet.com. Password - bt

At this point I get the error "Internet not connected. Please configure your parameters"

I've tested with an old TD-W9980 in wireless router mode using the same ISP details and connected via WAN port to the BT modem, this connects ok without any issues

Looking at the logs on the MR600 I can see the following when it tries to establish connection:

2019-09-23 13:56:21 [6] PPP: ppp0 sent [PADI Host-Uniq(0x0000115a)]
2019-09-23 13:56:39 [5] DHCPD: Recv INFORM from 10:65:30:14:00:9B
2019-09-23 13:56:39 [5] DHCPD: Recv INFORM from 10:65:30:14:00:9B
2019-09-23 13:56:41 [3] PPP: ppp0 Timeout waiting for PADO packets
2019-09-23 13:56:41 [3] PPP: ppp0 
2019-09-23 13:56:58 [6] PPP: ppp0 sent [PADI Host-Uniq(0x00001257)]
2019-09-23 13:57:03 [6] PPP: ppp0 sent [PADI Host-Uniq(0x00001257)]
2019-09-23 13:57:13 [6] PPP: ppp0 sent [PADI Host-Uniq(0x00001257)]

I'm not sure if i've missed something on the set up but any help would be appreciated