As you say in your OP, they told you "Fault appears to have been due to water ingress to distribution cabinet in contact with unsleeved wiring" in other words a large bundle of copper pairs, in a conducive medium. This will invariably adversly affect the xDSL. Moreover, it tends to put a buzz or hum on the voice lines due to the pairs becoming unbalanced wrt earth. You don't mention how well or badly your line worked ss a phone line.
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54 years ago