Moving from Virgin to Plusnet

[#1]

I'm currently with Virgin Media on their M350 cable broadband.

I have cancelled it and signed up with PlusNet for the FFTP 900mb service.

Hopefully PlusNet will be installed a couple of days before the Virgin cable is disconnected; however during the PlusNet sign up process I noticed that PlusNet seem to want me to do something related to the Virgin cable service? I don't understand what or why, as presumably a completely new connection will be made for the Plusnet service and my Virgin cable will just stop working?

Am I being stupid?  

[#2]

@stewartd 

We can't help if you don't tell us what PN are asking you to do.

Brian

[#3]

I am reading this and you appear to have already given notice to Virgin Media  to cancel the M350 service.

Also placed a separate new internet order with Plusnet for 900Mbps FTTP.

How could Plusnet become aware of the Virgin Media service unless you informed them ?

What are we missing.