I think you need to go back to the lawyers who have been dealing with your case as they will know all the facts.
Was it an appeal or a request for a review? It can get very confusing and it should be clearer.
If you got a refusal to give permission to appeal from the first-tier, you can go to the UT and it should give you details with the refusal which should also set out the reasons for the refusal. But this must be on a point of law.
The SOS-SEN document says:
Application for review where circumstances have changed
There is an additional power to review available only in SEN cases, where circumstances relevant to the decision have changed since the original decision was made: e.g., the Tribunal has decided in favour of a particular school because it is told that there will be a hydrotherapy pool built by the time the child arrives, but plans for the pool are subsequently shelved.
The application must be made in writing within 28 days after the decision notice was sent. However, it will often be the case that the change in circumstances will only come to light after the 28-day period; in that event the applicants will have to apply for a time
extension but, if they can show that they did not delay and entered the application quickly after finding out the relevant facts, they will normally be granted the extension.
In relation to an emergency review, this gives the parties the chance to discuss changes in circumstances and amend the statement if necessary.