BT Smart Hub in bridge mode into TP Link router - PORT FORWARDING NOT WORKING

[HB1]

I have recently moved to BT Business Broadband and I cannot forward any ports. 

My setup is:

BT Hub (bridge mode) --> TP Link Archer MR600 --> switch

I have set up port forwarding in the TP Link and it simply doesnt work.

Any gotchas people are familar with? 

Much appreciated!

[spank]

this is a handy site to check open external ports

http://www.t1shopper.com/tools/port-scan/

Also in a command prompt type netstat -ano |find ":your port number" and if it doesn't return an IP then the device you are forwarding to is not listening.