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Thanks Mark, this is really useful. The tips about GNSS constellation are handy – I wasn’t concerned as such (GPS alone should be fine), but perhaps I just get better GPS signals in my location.
Just for some further followup (incase anyone else finds this), after leaving the offending unit on overnight, it produced a 3D fix. However, later in the day, both units then lost signal completely. As they are now mostly synchronised in their ability (or not) to get a fix, I think the remaining issues are due to my testing location (and so they will hopefully work in the field).