@terziyski 

Thankyou for your help.  This is helpful and great information, however I am still a little confused with my particular setup.  I did originally see your guide.

With my ISP, it doesn't require a login / account, so I technically should just get an ADSL connection, however if I delete the original connection and just have a Bridge, then I don't get an IP / Connection from my provider.  

Afer reading your posts, possibly is has something to do with my ISP's VLAN set up, so I will contact my ISP and check for any particular requirements.  I also read something about existing leases having to expire before the connection will establish again after changing to bridge (possibly becuase my provider doesn't require logon as such, so it needs to refresh) , but not sure if this is true.

Many thanks,

Binza

  @TPBINZA 

I have the same setup with a UDM Pro.  The solution I found no one has talked about.  Delete all internet profiles, make one in bridge mode as explained everywhere.  Setup your router to do the ppoe login. 
 

To get this to work properly without double nat I had to go to advanced —> network --> lan settings —> edit —> turn off dhcp. 
 

This turns off the tplink from handing addresses to the router.  In the unify app, I go to settings, internet and watch the port address for the wan, it should have a wider address handed from the provider.  I was getting 192.168.1.100 every time until I turned off dhcp in the tplink lan settings