Thanks for your reply.
I forgot to mention my full setup.
My IP on my WAN is what dyndns.com account is set to 'see', so if it was 18.104.22.168 then I set this IP in my dyndns.com account.
192.168.1.5 is the computer with the apache and WebDAV server on it. So I need to forward port 80 of the router to 192.168.1.5. That sounds great, but now I have router problems. Rather than talking specifics routers (after all how many others have 'my router') are we referring to NAT Port Triggering?
I found a detailed guide for my router here
For example if these were my settings:
Default Gateway: 22.214.171.124
WAN IP 126.96.36.199
How do I set this up? Anytime I type in my new dynamic IP in a browser, all I get is the router config and not my served page!
Maybe if some kind soul would tell me which section I should refer to, I will pester you no more! Thank you.