This is the first post in which you've actually said what you SEE as being wrong.
I would have though my issue was obvious. Browser taking much longer to load. Email client much longer to load and other apps.
No, the issue is not obvious at all - you referenced line speeds with zero context.
@Gandalf advised of the line speed and told you it was better than estimates.
After prodding you produced speed estimate information which only you can access, which again indicated that the line is performing faster than expected.
Looking at the data transfer speed tests they are right on the nail for data transfer on a line with a 17mbps SYNCH speed.
Without the information from the router, it is not possible for community members to assist you. They key piece of information required is SNRM (signal strength) and attenuation. As for the change PN suggested, in some cases on very good lines, the line management systems will push a line to go faster, though that might introduce stability issues or elevated error rates ... however, the speed tests somewhat imply that might not be an issue here.
Increasing the signal strength might reduce the error rate thereby reducing the retransmission over heads, however the line speed WIIL be lower. Until this post YOU have focussed on the line speed.
The problem your describe could simply be that the wifi network is now different. It could be that the BT Wholesale connection to the internet is carrying more traffic. Neither of these are down to the ISP.
Oh and it's the PlusNet router I'm using
There are several Plusnet routers ...
...if you need help with self help, try reading the speed issue topic - see the link below.
@Gandalf has anyone looked at the S-VLAN here please?
Superusers are not staff, but they do have a direct line of communication into the business in order to raise issues, concerns and feedback from the community.
