The aim of the study was to evaluate the influence of community pharmacists' training performance on providing clinical medication reviews, and the influence of their training and medication review performances on their self-assessed competence in two Primary Care Trusts (PCT) in England. Data were collected on training and medication reviews, and a postal survey, developed to measure pharmacists' self-assessed competence, was administered. Simple regression was used to predict medication review performance and multiple regression to predict self-assessed competence. The better the pharmacists' performance in Pharmaceutical care planning module, the better their performance in suggesting actions to solve drug related problems (DRPs) in medication reviews. In addition, the better the pharmacists' performance in suggesting actions to solve DRPs, the poorer their self-assessed competence in "delivery of patient care" competency cluster. While the training supported the provision of medication reviews, pharmacists may need more continuous, individual support and feedback to further develop their ability to self-assess competence.