Hi again
BT operator said i will tweak your hardware remotely which she did and she sent me a link to use for future reference.
I find alot depends on who you are speaking to on chat.
The link is https://speedtest.btwholesale.com. Put this in web browser on computer or laptop and it will should true speed. Using a mobile or tablet they will give lower reading as they are not capable to do a test propeerly.
The only 'tweak' they can do is change WiFi channels. You can do that yourself.