I can also see the new one outside the job centre, which is in Streetview May 2015, but not in 2014. No number visible. Other than that, there's a complete dearth of cabinets, except small ones that seem more likely to be VM. Lots of green wheelie bins though...
It looks like the exchange is actually behind the job centre, so that one is likely to be a cabinet for old EO lines. If it was there a year ago, then timing might suggest it is cab 81, which is already live. However, all the cabs in the 80's look to be ones centred around the exchange - so perhaps they are all new PCP's for EO lines.
Do you know if you have always been on cab 83? Or if that cabinet number has recently appeared in the checker?
My suspicion is that this is a conversion from an EO line, and that the database updates have not gone through smoothly - or just not completed yet. The checker tells us that "fibre multicast" is present, which is a marker that tells us a live FTTC cabinet is there, in my experience. It seems likely that the data that *ought* to give the checker an idea of whether FTTC is available is not correct - so has perhaps not been initialised correctly in the EO conversion process.