In order to rule out the Homehub as potentially being the device responsible for your speed loss, you can connect the Openreach modem directly to the PC and see if the speed improves.
To do that follow these steps:
Step 1: Remove the homehub from the modem cable
Step2: Connect your pc/laptop to the modem via the cable instead
Step3: Open network and sharing centre on windows and click set up a new connection or network
Step4: Connect to the internet then click make a new connection Broadband PPPoE
Step5: Username email@example.com and the password as BT
Step6: connect, If it doesn't, keep pressing try again until it does.
However, please note that this will stop any other access apart from the PC
Thanks Ray, wil try that. If that is the issue that would explain the dropping speeds but not the sudden drop in my IP line profile speed? Its saying max achievable speed i can get is now around 53mbps., when it was clearly more then that.
Yes, but thats what im saying. The estimate for my line has dropped in the last week or so. It was saying i could get speeds of up to 76 mbps.
as you have the modem and hh4 you probably have had infinity for more than a year and in that time more customers have been added to your cabinet and the data from these connection is used to update the estimates and make the estimates more realistic - unfortunately that normally means the estimates are lower now than a year ago
I suppose it depends on how often you run the dslchecker as estimate may have dropped weeks ago