Looks like you've got neutral blue left, permanent live middle, and switched live right. You'll have to wire them all back in the same order or you'll knock out a light somewhere else in the landing, looks like a pick up to feed another light in other words.
It's just that in a lighting circuit you can pick up feeds, neutrals, lives and earths from existing lamps Paul, so if you want to add a lamp somewhere you just tap into an existing feed.
Make sure you switch the lighting circuit off at the consumer unit Steve or you'll give yourself a belt. Even with the light switch off there's permanent live in the centre which you can only isolate with the circuit breakers.