Hello Sarah, and welcome to the board,
As already said, the pics are a little too small to get the detail that is needed to give an informed opinion (I have tried copying them too enlarge, but they just pixelate). For instance I cannot see the pontil mark in any detail; since this is crucial to dating and ascribing Nazeing, that is a bit of a problem.
Also we need some sizes please, diameter across the top of the bowl will do, but anything else may help. If you can't get more detailed pics a good description of the pontil may well help, along with the measurements.
It is most probably Nazeing, but it is a question of whether it is from the post-war production, or, what is being referred to as Elwell era. Dating is a problem in any case, since details of dates are not known, only generalisations based on Geoff Timberlake' research and book.
Kind regards, Nigel