The worst was DL 0.01 now stabilised at 0.11 after fitting the accelerator on the 7th.

My question is how do I get onto the BT forum as it requires my confirmation to register by email link. The strength is too weak to link. I've tried c+p but it takes me back to my email. I do not wish to speak to CS.

Try the router (BT Home Hub?) in the Test Socket of the Master Socket. Now check the speed that the router is reporting (192.168.12.254). If the speed has improved you have an internal wiring fault which is your problem not your ISP's. If the speed remains the same, call your ISP.