@TechWeasel
There is no bridge mode which is a pity but with some clues from support at broadbandbuyer UK I have been able to get the equivalent set up working. Full details of how I set it up follow. My home router is a DrayTek but a similar approach on another router should also work.
On TP-link Archer MR600 4G router:
If need be, reset router using pin at back
Login at 192.168.1.1 (or whatever IP if already changed)
Disable WiFi (not strictly necessary to make it work, but if you already have a WiFi network you won't want this on as well)
Click "Advanced" tab at top
Click "Network" left hand side
Click "LAN Setting"
Change IP address to 192.168.0.1 (or something on a different subnet to your existing router)
Leave DHCP enabled (that's right, do not disable)
Click "Save"
Router will reboot.
Connect an Ethernet patch cable from any LAN port on the TP-Link to the WAN2 port on the Draytek router
You can also reserve the Draytek IP address:
Go to "LAN Settings"
Click "+ Add" under Address Reservation. Click "Scan" to find the MAC address, Click "Save"
Currently 192.168.0.102 is reserved for the Draytek in my case.
On Draytek router
Click "WAN > Internet Access"
On the WAN2 line of the table select "Static or Dynamic IP" under Access Mode col. Then Click "Details Page".
Select "Specify an IP address" and put in 192.168.0.102 or whatever IP your router (DrayTek in my case) was given by the TP-Link. (It might be better to chose a different IP address with less chance of a collision with another client of the TP-Link - e.g. 192.168.0.199 - needs to be within the IP range set up on the TP-link but if you have no other clients connecting to the TP-Link it won't matter).
For the subnet mask put 255.255.255.0 and for the Gateway IP address give the address of the TP-Link, in my case 192.168.0.1.
Click OK and let router restart.
That should provide a basic internet connection through to the DrayTek.
I was advised that ideally the IP address of the Draytek WAN2 port (192.168.0.102 in this case) should be set up as a DMZ on the TP-Link. This will allow things like port fowarding set up on the existing router (DrayTek in my case) to work without replication on the TP-Link. Obviously you'll want your NAT / firewall working on the (DrayTek) router to protect clients from a raw internet connection.
On TP-link Archer MR600 4G router:
Click "NAT forwarding" on left hand menu
Click "DMZ"
Check "Enable"
Enter the IP of the DrayTek router - 192.168.0.102 in my case
This all seemed to work for me and was able to stream Spotity, Netflix, do email, browse and play online games on clients of the DrayTek for several hours. I've not tested it over a long period yet.
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