Morning Rosie,
I hope you managed to get some sleep last night, what an awful situation for you all to be put in. The best way to make them pay for what they have done to you and to ensure that they don't do it to someone else is to pursue a civil claim and disciplinary action against all those involved. So you now need to go into evidence gathering mode whilst it is all still fresh in your mind. You need to put together and keep a record/diary of everything that has happened in relation to:
1. The FACTS - keep a record of dates, approx times, names of people involved, details of telephone conversations and emails in chronological order. Any emails that you have sent to/received from the college and IOC, governors (when contacted), MP etc, should be printed out so that you have a hard copy in case anything is accidentally deleted. Also consider saving them all to a memory stick. Full details (as far as you can remember) of what was said in any meetings that you had, were meeting took place and who was involved. Going forward any telephone conversations with anybody involved - make sure you take notes of what is discussed and always follow up with an email. So eg if the senco contacts you by phone and discusses XYZ, email her after the call and say " Dear senco, just to confirm our telephone conversation of today's date when you stated XYZ". Also record in as much detail everything that happened with the police last night and what action they took, and details of your telephone conversation with the Senco.
2. Damages can also be awarded for DISTRESS caused so keep a record/diary of how it has all made you feel - scared/frightened/ for your safety and that of your daughter's from birth family. Also record what happened last night - how it has all affected your daughter- how frightened she was about birth family turning up. Also record how the actions of the college, their refusal to cooperate, has compounded your distress - not knowing what information that had given the birth family and how you were forced to dial 999 because you were so scared for all of your safety.
Keep this diary going and record everything that happens in as much detail as you can. Your solicitor will need it.
When you eventually get in touch with the governors make formal complaints against all persons involved and tell them you want disciplinary action to take place. Not sure if you may need to go to the DFE about this - and disciplinary action may have to wait until the outcome of the court case. Also inform the governors that you want the exclusion removed from your daughter's file. For safety reasons your daughter will now not be able to return to that college. Pursue the IOC also about what action they can take against the college.
One other point to mention to your solicitor is about whether or not the member of staff who knows the birth family has actually taken any photos of your daughter on her phone and passed this on to the birth family. So the birth family may not only have your address, contact details but also an up to date photo of your daughter.
You should change landline/mobile phone numbers immediately. Get receipts for any costs involved and give these to your solicitor as the college will pay for this as well.
When you do move do not leave any forwarding address with your buyers and also don't give your new address to social/adoption services either. The last thing you need is for one of them to give your new address to the birth family (this happened to us not long after we adopted our daughter - luckily we were in the process of moving anyway but I have since completely refused to give our current address to our daughter's placing authority).
take care xx