I have no idea what has gone wrong, so I have used an external to wipe the drive and re-install. SO FAULTY.
MacBook Pro A1708 Faulty
Apple MacBook Pro A1708 EMC 3164 NON WORKING Faulty Spares & Repair
Apple MacBook Pro A1708 2017 13" Core i7-7660U 2.5GHz 256GB /16GB - Faulty
2 X MacBook Pros A1708 & A1989 Faulty/parts
Apple MacBook Pro A1398 *Faulty / Untested* (F52)
APPLE MACBOOK PRO A1278 , FAULTY