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Assuming that your bulb is wired correctly:
Ie. one bulb terminal is permanently connected to neutral, and the other terminal is connected to a "switched live" which is a live connection which can be "made" or "broken" by your light switch....
Then I'd first inspect that the switched live has not shorted somewhere, such that it is permanently being made, albeit not by your light switch.
A cheapy multimeter would make testing this a lot easier.
Electrickery time
Light in daughters room won't turn off since this morning.
Replaced bulb and light switch (only had a 2 pole to hand if that makes any difference?)
Removed switch and it stays on too.
Checked the rose and all looks fine. All other lights are fine.
Any ideas before I get a grown up?*
*am competent enough. Not to stand in a bucket of water to reach