Have you tried our Frequently Asked Questions? See www.sarh.co.uk/faq
Why must I apply for permission before a Mutual Exchange?
You are legally responsible for your home and for the prompt payment of the rent. You are required to keep to the terms of your Tenancy Agreement and must not exchange or Assign your Tenancy without SARH consent. SARH will take legal action against you if you exchange your home without permission.