I get an estimate of 30.1/6.2.
My cabinet is 500m away, measured along the route the line is most likely to have gone by when the estate was built (15 years ago).
At the time I first looked, I didn't know where my cabinet was.
However, there was a useful map available that showed which postcodes would get FTTC service. More importantly, from this point of view, it also gave the cabinet # for each postcode and the location of that postcode.
Armed with that information, I started interrogating the BT DSL checker to get estimates for different local places - sometimes I used postcodes for a rough estimate, and sometimes I used a phone number to get more accurate results (some phone numbers I knew, and some I just googled).
That set of results gave me a rough idea of exactly where the cabinets were - because they had to be close to the places that had 40Mb estimates, right?
Unfortunately, Openreach got that map removed, so you can't see the postcode & cabinet numbering any more. The technique is still possible, but you have to find your local postcodes elsewhere, and their locations, and still be lucky anyway.