My question to those forum members who understand the technicalities better than I do is whether it is true that aluminium cabling between the Cabinet and my house will restrict the service I can get
Correct. Generally speaking aluminium has a higher attenuation rate than copper cable.
and is it the case that I have reached a plateau which won't improve unless re-cabling takes place?
At the moment yes, but of course G.fast is on the way in the near future and will potentially give you a higher speed. The cable won't be replaced unless it is actually faulty.
Edited by troublegum (Sat 11-Mar-17 15:37:57)