Association of Ulster Drama Festivals
Drama Association of Wales
All England Theatre Festival
Spotlight Publications
The Association of British Theatre Technicians
Plays by regular SCDA adjudicator Ron Nicol
Samuel French publishers
Scottish theatre
Cressrelles Publishing
Cordiner Press – plays by Isabella Rae
Performing Rights 
International Performing Rights Ltd

National Drama Festivals Association
Nick Hern Books
Voluntary Arts
Free Music Archive

Additional Resources – Websites & YouTube instructional videos

Technical Sound Black Light Lighting

Voice – National Theatre vocal warm-up – Breathing, Resonators, Projection, Diction

Warm-up games – lots of fast and fun warm up games – using the space effectively – warm up games – playing with speed and group physicality

Stage Fighting

You can find lots of useful instructional videos on YouTube, here are a couple of examples

Stage slap
Stage punch
Intimacy on Stage

It is important to ensure everyone is comfortable and gives consent in the rehearsal room and onstage.  Here are a few useful links