IMHO it’s going to be a records issue , not a physical issue, as already explained there are a very small number of ECI headends ( where location where the fibre service originates ) these can only deliver 330Mb , but if you were connected to one you would have an ECI ONT but you don’t you have a Nokia one , which means you are connected to a Nokia or a Huawei headend , both can provide 1Gb speeds ( sold as 900Mb )
Headends are not at every exchange , they cover relatively large area, ( many individual adjacent exchange areas are served from one headend ) and again as explained the distance the fibre travels before it reaches your location is fairly irrelevant , and the way the fibre cables are routed it would make no sense to have fibre cables from 2 headends in one location.
0800 587 4787 is the number for the BT FTTP customer service number , if you haven’t already you probably should contact them….you actually haven’t posted any speed test results etc , but presumably speed issues are why you have posted on here…..post the results from the BTw speed tester or a reputable alternative, use a device like a laptop that is capable of 1Gb speeds , using an Ethernet connection not WiFi.
