VDSL Line Stats - Worth upgrading to 80Mbps package?

Broadband Link Downstream Upstream
Connection Speed 39973 kbps 8349 kbps
Line Attenuation 23.8 dB 0.0 dB
Noise Margin 7.7 dB 6.6 dB

Without seeing the "attainable rate" it is only possible to guess ... Can you get that?

With 23dB attenuation, and 7.7dB of margin, I would suggest that the best downstream you will see will be around 45Mbps and Upstream will stay the same.

So, my recommendation is NO.

my recommendation is to have BT Unlimited Infinity 1 up to 52 Meg down and up to 10 Meg up.