Are you noticing any real world issues , or just the speed test indicating a download less than the minimum speed guarantee ? .
As explained, you are part of a network ( PON , passive optical network ) so the 2.4Gb bandwidth to the headend is shared between you and up to 29 others , most of the time , in the majority of settings this is more than ample bandwidth to satisfy everyone , if you are unlucky and happen to be on the same PON as a few intensive users ( constantly placing large demands on the available bandwidth ) then everyone could experience a slowdown , but even in these situations, getting 600Mb for the few seconds of a speed test instead of the guaranteed 700Mb ) would only be noticeable as a speed test it’s unlikely to present any noticeable issues.
Possibly counterintuitively , you and your neighbours constantly performing speed tests , exacerbates the ‘problem’ using bandwidth for no good reason .
As stated , in these circumstances, there isn’t a lot to be done ( assuming there isn’t some issue and it’s purely a congestion issue ) claiming the £20 , potentially 4 times in a year ( so effectively an £80 discount ) is the compensation for this situation.
If that isn’t good enough, unless a different network is available, and you have the option to leave Openreach FTTP , then short of asking your ‘neighbours’ to stop speed testing , or downloading huge files , there may not much that can be done.
TBH , the WiFi access issues have nothing really to do with congestion on the PON itself ( if the PON is actually congested ) , this is normally confirmed if the issues only appear at peak times , so if outside peak times , late evenings ( after 9pm ) or early mornings don’t ever show speeds below the minimum, it’s probably congestion…something to bear in mind , sometimes automated upgrades can be running in the background, so if ( for example ) Microsoft have an update , and several PON members are being delivered this , it could be a temporary problem
