From here, you can access the model section 106 agreement (second edition - June 2010), prepared by the Law Society's Planning and Environmental Law Committee, for use by all parties involved in the planning obligations process.
Click on: Model Planning Obligation
Access can also be obtained to guidance produced on the use of the model agreement in Circular 05/05: Planning Obligations. (Note: now superseded by the National Planning Policy Framework).
Click on: Circular 05/05