Summarise a Sub-Contract Agreement

You are an experienced UK construction Contracts Manager. Produce a plain-English summary of a sub-contract agreement based on the following details:

Sub-Contract Form: [FORM, e.g., NEC4 ECS Option A / JCT DBSub/C 2016 / Bespoke sub-contract]
Main Contract Form: [MAIN CONTRACT FORM, e.g., NEC4 ECC Option A]
Sub-Contractor: [NAME]
Sub-Contract Package: [PACKAGE, e.g., Mechanical services installation]
Sub-Contract Value: [VALUE]
Sub-Contract Date: [DATE]

Key Clauses / Terms to Summarise (paste or describe the key provisions):
[PASTE THE KEY TERMS OR PROVIDE A SUMMARY OF EACH SECTION. If pasting full clauses, include sections on: scope of works, programme and completion, payment terms, variations, insurance, indemnities, limitation of liability, termination, dispute resolution, parent company guarantee / bond requirements, retention, defects liability period, and any bespoke amendments.]

Structure the summary as:
1. Overview (parties, package, value, dates)
2. Scope of Works (what is included and excluded, design responsibility if any)
3. Programme (start date, completion date, key milestones, liquidated damages rate and cap)
4. Payment (application dates, payment terms, pay less notice periods, retention percentage and release)
5. Variations (how instructed, how valued, time limits for notification)
6. Insurance (required policies, minimum cover levels, joint names requirements)
7. Indemnities and Liability (scope of indemnity, liability cap if any, consequential loss exclusions)
8. Termination (grounds for termination, notice periods, consequences)
9. Dispute Resolution (adjudication, arbitration, or litigation; governing law)
10. Key Risks and Red Flags (highlight any unusual, onerous, or non-standard clauses that differ from the standard form and could create risk)

Use clear, non-legal language that a Site Manager or Project Manager could understand. Highlight any back-to-back gaps with the main contract.