A new pre action protocol for judicial review applications came into effect on 6 April 2015. Rather unfortunately, it was not published. You can now find it here (h/t @NearlyLegal). The judicial review pre action protocol applies in both the Administrative Court and the Upper Tribunal:
The Upper Tribunal Immigration and Asylum Chamber (UTIAC) has jurisdiction in respect of judicial review proceedings in relation to most immigration decisions.4 The President of UTIAC has issued a Practice Statement to the effect that, in judicial review proceedings in UTIAC, the parties will be expected to follow this protocol, where appropriate, as they would for proceedings in the High Court.