The only footwear that can be worn on the pitch, either for training or for matches, is boots with moulded or screw in studs.  Boots with blades and trainers cannot ever be worn on the pitch. This applies to anyone who passes through the pitch gate, including coaches, physios, team managers, non-playing players, referees, assistant referees, etc. This rule also applies to anyone else using the pitch, including other Clubs who have booked the pitch and opposition teams.

See the document below for the RFU Guide to using AGP's (Artificial Grass Pitches)