1999 focus starting problem

Hi All,
does anyone have any ideas why my 1999 UK ford focus has started to "not start first time", the garage have checked the spark pluggs and adjusted
and cleaned them but the problem remains. it does not have to be cold or wet just left for more than 6 hours and it does not happen all the time.
The car has just been serviced at 70K miles
Thanks
Paul
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Have you checked the battery level to see if it is low?

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