Thought I give an update the cabling has now been replaced with Cat 5e (Excel is the manufacturer of the cable) and its solid copper, all the relevant standards appear to be written on the cable.
They still need to replace two lines that lead into the house, the builder has notified the electrician to replace these. So good result overall.
Nagging helped
Can't test these until I move in, any good tips on how I could go about testing between two lines / points. End to End testing.