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Guide to troublesome battens...

1. Have you put pennies in the meter?
2. Was the fitting working yesterday?
If so when you last switched it on did it flicker for 30 seconds and is
the lamp black at each end? If very black change starter and lamp,
if lamp ends are not black, change starter switch.
Note: Starters for 70w / 75w / 100w are different from "universal 8watt to 65 watt starters. Twin circuit 18w / 20w will need a quality starter.

OK so it still does not work.
Well hi kick may help but causes hernia so .................
change lamp and starter for ones that are working in another product.
It is possible for a choke ( the box like object inside the fitting) to
fail but normally it is because the lamp has been left in a failed condition
whilst trying to start the lamp the control gear has overheated.
If it has been left in overheated condition it will have to be replaced by another with a three year warranty from TLC!

What if the fitting is an old 1800mm/ 6 feet long 75/70 watt (or 125watt
2400mm)? Then the lamp may not work because the fitting had a leading
circuit with a choke in series with a 440volt capacitor. If stressed by
starter switch problems these capacitors can fail after 8 years and will
have to be replaced by the same value item.
What if it is a twin and only one side is out? Then if it is a 75 watt the
leading circuit capacitor is the problem.

OK so it is a brand new fitting straight out of the box and has never been used
1. Ensure starter is twisted in.
2. Check volts are present at the term block.
3. With electricity off (ideally at mains) check all wires are in all connections.
4. Using neon screwdriver check fitting is live on both connections of choke.
5. If a twin or multi tube fitting there may be a crossed connection,or only one tube works
to check for this ensure that wiring is followed through and that the circuit for each
lamp is intact,
terminal block to choke -
choke to tube -
tube to starter switch -
starter switch to other end of tube -
tube to negative on terminal block
( each tube has two connection at each end )
with twin 18/20watt the end of one connection in each filament in adjacent tubes are joined together.

6. Check that the supply in the building is not less than 235 volts.

OK so it is much more modern and has electronic high frequency control gear
and it has worked for say two years, personally I would give up and look
for replacement control gear. If it has never worked and you have NOT megga
tested the fitting then complain!

Suppose it is a new installation and one fitting in ten is not starting
properly, have you over loaded the circuit beyond the rating of the switch
or beyond the supply current?