So i contacted them about using my own router.
Here's the transcript.
I also called and have a recording of the conversation with them saying they would provide me the username and password.
Chat start time Jan 29, 2017 8:53:44 AM EST
Chat end time Jan 29, 2017 9:02:07 AM EST
Duration (actual chatting time) 00:08:22
info: Sorry for the delay, we are currently experiencing high volumes. Please hold for the next available adviser.
info: You're now chatting with Summer.
Summer: Hi Jon
Welcome to Vodafone broadband!
How are you today?
Jon: Good thanks
Glad to hear that!
How may I assist you with Vodafone broadband deals today?
Jon: Can I use my VDSL modem with Vodafone broad band ?
Yes, you will be able to use it with Vodafone broadband.
Jon: So you would provide the pppoe user name and password ?
Jon: That's great. I read that you didn't allow 3rd party routers so that's good news.
Please don't worry, you will be able to use it.
Jon: Thanks summer.
When are you planning to order the deal?
Jon: My current contact is up next month so I'm getting quotes
Jon: Thanks for tor help today.
Oh okay, please feel free to ask if you've any other query regarding Vodafone broadband services. I will be glad to assist you with them.
It was my pleasure assisting you!
Have a great time ahead!
info: Thanks for chatting with us.
They are the cheapest option for me so if the above is for real then i'll give them a try.