See Rondski's post directly above yours.
The postcode checker only shows ADSL results, use the address checker with only your postcode in then pick your house number. You may see the correct results.
That is exactly what I did. It did not return any results on the cabinet it is connected to. It just shows Exchange BISHOPSGATE no cabinet number because my line is still on EO.
If you look at my post from 17th of August, it was like this.
CONNECT
We're connecting power to the new fibre cabinet and joining the new fibre lines to the existing copper network.
You can't order a fibre service today but typically it'll be available to your premises within the next four months.
Find out more about the fibre journey.
Exchange name: Bishopsgate
Exchange status: Fibre enabled
Cabinet number: 5
Technology: -
Obviously it was cabinet number 5 pointing to the one in Hanbury Street. This was also reflected in the Wholesale DSL checker when I did put in my address instead of the postcode.
But both of these search results have now reverted back to this few days later in August and has stayed that way.
BT BROADBAND AVAILABILITY CHECKER
Address ______________________ on Exchange BISHOPSGATE
You're in a plan to get Superfast fibre but we haven't started work yet.
It'll be built either as part of our fibre programme or through a partnership with your local authority.
Cabinet icon
Exchange name: Bishopsgate
Exchange status: Fibre enabled
Cabinet number: -
Technology: Pending - EO Line
That means they have not yet connected the EO Line to this new cabinet. I'm not sure if they have changed their minds or simply haven't re-updated the checker to let us know otherwise.