Thanks for posting and a warm welcome to the community.
I'm sorry to read that you are experiencing slow broadband speeds.
From checking your connection, there is a high peak time traffic fault in your area which is causing slow speeds. Our networks team are investigating the problem and are improving bandwidth and performance to help with this issue. The reference number is F003477649 and with a review date of 28th December.
If you complete a speed test through a wired connection, what speeds do you achieve?
Do you only notice this issue during peak hours or can it be at any time of the day?