The Purpose of Annexation

The purpose of annexation is based on the case of Leigh v Taylor [1902], D'Eyncourt v Gregory [1866] and Dean v Andrew [1986]
In the case of D'Eyncourt v Gregory [1866], the chattel will become a fixture if the purpose of annexation is to improve the property itself. 
In the case, of Leigh v Taylor [1902] , the chattel will remain as a chattel, if the purpose of annexation is so that the chattel could be enjoyed as a chattel. 
In the case of Dean v Andrew [1986], the objective consideration is proposed in identifying the purpose of annexation. The subjective consideration may be persuasive.
In general, the purpose of annexation will determine either the structure is a fixture or not ?