I have asked AAISP to see if its marked as available for them, if I remember right L2TP is inclusive on a broadband account with AAISP.
So if they say it can be ordered, I think I will until the end of my VM contract get the 160mbit 1TB service online, can try out CF on this and see reliability, L2TP will also remain avilable for VM should I need it, so thats a net £27 which is only barely £7 more than the days I was paying AAISP for VDSL, and I will have 1gig VM alongside 160meg AA.
Then if all seems good, when my VM contract ends, bump the CF to gigabit and cancel VM next April. This I will do 1-2 months prior to end of VM so I can make sure performance is ok before cancelling.