When left overnight or for long periods, our 2002 Focus 1.8 TDCI turns over for 10 seconds before starting/firing.
It is then fine for the rest of the day and usually starts within 2 or 3 seconds.

There are no fault codes, no lights on dash, battery is brand new, it has had glow plugs within the last 6 months, injectors have been 'leak tested' and are fine. Car has done approx 104,000 miles.

Any ideas please - it's driving us mad!?