Moving my number to vonage has also broken BTs broadband availability checker for me. Crazy. Just wish I had ADSL to be honest.
Seeing as you longer have a BT phone number, why do you find it surprising?
I would expect the Address Option of the
this checker to work, but as Zarjaz asks, why are you interested in that? It isn't going to answer your question.
This does, (click
"Unpackaged Broadband") with ADSLx visible and Infinity if you scroll down.
I suggest you definitely migrate back to ADSL next time you move

. The only sensible choice for anyone.
My broadband basic info/help site -
www.robertos.me.uk. Domains, site and mail hosting -
Tsohost.
Connection - AAISP Home::1 80/20. 200GB. Sync 75498/13861Kbps @ 600m. BQMs -
IPv4 &
IPv6