The Planning Inspectorate will email out the appeal decision to you or your planning consultant. If you get planning permission, then you will need to look at any conditions that have been imposed.
If you are refused permission, an Inspector's decision may be challenged in the High Court within 6 weeks of a decision and must be on the basis they have ‘erred in law’. For example, if there was a mistake in way the appeal was carried out or some vital information was ignored.
If the High Court upholds the challenge, a different Inspector will reconsider the appeal avoiding the mistake, but it is possible the outcome will be the same. Taking a case to court is an expensive process and, if you don’t win, costs could well be awarded against you, so you are strongly recommended to seek legal advice if you are considering this course of action.