I would really appreciate some assistance with getting this setup to work

I have a 7800N upgraded to 1.06h.dt2 as a PPPoE dialler, Firewall etc connected to a BT modem for Zen fibre.I have recently bought a block of Public IP addresses to use so I may be able to host servers internally.
The problem I have now is actually getting this to work.

From the reading I have done I have used the 'Virtual Server > One to One NAT' feature to Add all 5 usable external IP addresses from my range to the EWAN interface.
Then I selected 'One to One NAT Table' and assoiciated one of the 'Global IP Addresses' with an internal IP address - which happens to be my internal server.
Now my expectation is that any traffic to that IP will be immediatley forwarded to that internal server - but what is actually happening is that if i put one of Global IP addresses into the browser i get the Router Admin page. I am a bit confused.

I have uploaded some pics to show my config:
-One-to-One NAT -One-to-One NAT Table