NAT usinf l2tp on wan

[rfinch23]

Hi,
So what I want to achieve ;
I have a very bad broadband connection so use a very good stable 4G connection with 3 mobile UK with a data sim.
I have devices behind the 4G router that need to be accessible from the web.
The supplied router has the ability to setup a l2pt to a service provider in this case Andrews & Arnold
The 4G router will not NAT/port forward using the l2tp ip address.
I have therefor installed a pfsense F/W behind the 4G router.
I have three interfaces setup, WAN, LAN and l2tp
I have the l2tp setup and working ,
F/W rules are basic
WAN Blocking all
LAN allow Any an one rule that appeared after entering one NAT rule
Anti lockout rule?
L2tp one rule to allow TCP source any port 80 , destination 192.168.70.100 port 80 gateway any queue none
The test NAT is
L2tp interface TCP source address allow any source port 80 – destination address any, destination port 80, NAT IP local host 192.168.70.100, NAT ports 80

DDNS is setup and working

When I try and get to http:rfweb.ddns.net it is trying to take me to the pfsense logon page and not to the test web server.

please help as very new to pfsense.

Thank you.

ROY