SQL - The field contains NULL, 0 or 1 - i want to see anything but 1 - how to write

Hi

I only want the column to bring back 0 or NULL - ive tried 

• <>1      but that only brings back 0  

• IN (N' ', N'0') but doesnt like it,
• LIKE...
• NOT = N'1'

nothing works, they all bring back (if work at all) 0 and not NULL and there are definitely NULL in the data

Thanks 

Sarah