Thanks for taking the time to contact us in regards to your broadband speed problems, we appreciate you raising this via the forums and welcome to the community.
From looking at your connection and equipment there does appear to be an issue with the downstream power level's, this will require a technician to attend. I have booked one for the 20th April between 4pm and 7pm. This is the earliest we can get someone out to you to look into this further.
Please let me know if there are any individuals shielding or if the appointment isn't convenient for you, we can look to reschedule this for the next available date that is more suitable for you.