A bisa wasu hujjoji na tarihi an tabbatar da cewa gwamnatin Birtaniyya ne ta shirya da kuma goyon bayan juyin mulkin da Ridha Khan ya yi a ranar 3 ga watan Esfand 1299 hijira shamsiyya (1920). Duk da cewa an kawo karshen mulkin Kajariyawa da kuma rage karfin mulkin ha’inai da ashararai, to amma dai ya haifar da wani tsari na kama-karya da wasu ‘yan tsiraru ke mulkan mutanen wata kasa da tsara musu makoma, inda 'yan gidan sarautan Pahlawi suka maye gurbin ashararai.