You should contact your UNISON steward straight away and arrange to meet them.
When you meet your UNISON steward it would be helpful if you took with you and material such as papers, documents, reports e.t.c that you may feel are useful for your steward to see.
UNISON stewards are well trained and well informed about the Barnardo's procedures and will advise and represent you through the ahole process and if necessary obtain legal advice on your case.