First Aid trainers
Here is a list of Peak and Yorkshire based first aid trainers I recommend.
Please feel free to download the notes and useful documents from any of the training course you have attended.
Please read the belaying lemons article as it has some great ideas of how to avoid potential problems with groups.
Here is a website for knots
A good article by the New York Times about the dangers of static stretching before activities
Attached are the course notes and some other very useful BMC pdf's. I would recommend reading the AALS belaying lemons as it is the best way to view peer belaying and AALA's belaying notes for inspectors The BMCtechcon 2006 is pretty full on and the info in there can be translated into the following articles on the bmc's website.
Video of Steve Mclure teaching lead belaying with a gri gri.
Here are two videos of dynamic and non dynamic (static) belaying