This Practice Note explains when you might choose or be ordered to appoint a Single joint expert (SJE) (under CPR 35.1 and CPR 35.2(2)). It looks at selection, appointment, instruction, conduct and fees and track and court specific guidance. Guidance is also given on how to challenge the conclusions of a SJE. This Practice Note also considers how a SJE’s evidence is given to and relied on by the court including via written questions and under cross-examination.

Experts and those instructing them are expected to have regard to:

1. •

   all relevant CPR Rules and Practice Directions

2. •

   the Guidance for the instruction of experts in civil claims ('the Guidance')

3. •

   Practice Direction Pre-action Conduct and Protocols, para 7

This Practice Note should be read in conjunction with:

1. •

   Instructing an expert under the Guidance for the instruction of experts in civil claims

2. •

   Checklist—letter of instruction to expert

3. •

   Letter of instruction to single joint expert (with drafting notes)