I will try the fix you suggest, but in the meantime....
I couldn't set the bandwith to 45KB/s because it doesn't go that high and then I realised it's because connection speed is set at 'Cable/DSL', which I presumed was the right one for me. Which goes back to my very first question: what do T1 and T3 mean?

I've tried to find this out for myself but no luck (at least not in language I can understand).

I just checked the link but it says "WARNING: The 3. "Repair" process will NOT work on versions of LW 4.4 or later due to different type of installer!"
So presumably it won't work on 4.10 PRO? Or am I being incredibly dense...?