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It's erratic, with no obvious Openreach policy. It varies from being informed every step of the way until the job's done (my experience with a line fault last year) to having no contact at all and the engineer simply not turning up.
Best to sit tight and the likelihood is that all will be well, but if it goes wrong a nightmare is on the cards. Openreach can be shambolic, not least because of excessive reliance on outsourcing to companies with an emphasis on quantity rather than quality.
They are supposed to Ring Before and Ring After an appointment, that does not always happen.
Ring to say they are coming, and ring again when they are finished any offsite work, to make sure everything is working.