Hi Paul,
Thank you for asking. You're right, Chadwell St Mary only seems to be described as a parish, despite being able to find the village on OS Maps. So I didn't create the location category. Instead, when creating the Chadwell St Mary Cemetery, Chadwell St Mary, Essex category, adding it to the profile, I set the location field to Grays Thurrock, Essex, since the cemetery address on the Thurrock Borough web site was given as Chadwell St Mary, Grays.