Middlesex competition regulations may be found here. Most Middlesex regulations make use of the ECB non first class regulations, a selection of which may be found here. Other regulations may be found on the ECB website and on league websites.
The regulations on this site are current to 2019. Some have been updated to 2020 and others will follow shortly. However, your league or other competition may use regulations which are not listed here, or may have updates which are unknown to us. If you are officiating for a club/league in Middlesex, please confer with your club and/or league representatives to confirm which regulations you are using, and ensure you have documented regulations in hand prior to the start of your match or competition.