The following comes to mind:
1. Assuming the SM was delegated functions of the committee, find out who agreed to the SM handling most of not all functions of the committee;
2. Ask him, her or them if they are happy with the situation and if they are not happy ask them how they plan to fix a problem they created;
3. Often committees will prefer to delegate many functions to the SM, thinking, erroneously that any misdeed by the SM will be the responsibility of the SM. False. The buck stops with the OC;
4. Please be aware that no matter how one sided a contract with a SM is, the contractual terms, if legal, trump anything Fair Trading can do to help you; and
5. What you will probably need to do is renegotiate the contract with the SM.
Hope this helps.