Update: Finally managed to get it to boot properly.
1. It seems that setting up a timed recording upsets the box i.e. for some reason the box does not, now after all these years, like the 1 TB drive. After setting up a timed recording using a thumb drive the box closed down correctly.
2. It also seems that, when that message appears, turning the TV on, from standby, somehow "corrects" the problem i.e. the box then boots properly.
This issue has only manifested itself after I replaced the old Sharp CRT TV fed with composite cables to the LED TV and a HDMI cable.
To say I am totally confused is an understatement.
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