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The original fibre was put in by Orange. I finally got round to signing up with them in the morning. The technician came round the same day. Pursed his lips. Made a phone call to his boss, and ran out the full length of an 80m cable to fix us up, including climbing over the fence of the abandoned house with his ladder. He also gave us his phone number and told us to contact him personally if we had any problems.
So yeah, paying the extra 10 euros a month that Orange costs was money well spent.
We found that Movistar would put their fibre in if we took up their mobile contracts with telly etc. ... expensive for a year but you can cancel or downgrade ASAP.