Agree with all that. Performance does vary with time. External line quality
regularly drops following heavy rain even though BT insist is is "fine". I
have a wireless router in the middle of a large-ish rubble stone house for
convenience, with wired ethernet to the main computers. Certainly got an
improvement in performance by running a better quality ADSL lead from the
RedFishShop direct to the master socket instead of to an extension.