Sounds like you have the connection of the switch for the landing light and permanently live supply mixed up and should be swapped around.
Do you know how the connections are made?
Are they looped in at either switch or light fitting or junction boxed from above in ceiling/floor void/loft space?
Pictures may help!
I have not had a real look round as we are still unpacking but i have a feeling that the connections are from a junction box because all the light switches are on the ceiling leading to the loft ( they are pull cord light switches). I will have nosy when we are all finished unpacking. thanks for the quick reply.
Just because you have pull cord switches does not mean that the circuit is connected via junction boxes, they could be looped in at the light fitting.
But this will need to be confirmed.
The fact that they look new would lead to the thinking that when the previous occupant or the person they employed or asked to replace the accessories, did not perform that task correctly nor did they prove that the circuit was functioning as it should after completing this task.
I would suggest uploading photos, taking notes of terminal connections in relationship to the cables and also either purchasing or borrowing a multimeter, so some testing can be done.