No luck with resolving this yet, I think they have tried moving him on the computer system so he is sharing with a different set of people from what I can gather but that didn't seem to help.
Apart from congestion, what could cause speeds to dramatically drop at peak times? Is it likely that an engineer visit would be able to fix this, I am thinking not as speeds are fine 1st thing in the morning and problem requiring an engineering visit would be permanent rather than peak time related?