“In my judgment, in common with the view of the UT in Portland Gas , a rejection by HMRC of a claim on the grounds that it is out of time, by reference to no more than the claim itself and a calculation of the applicable time limit, does not involve any use by HMRC of their statutory powers to enquire into the claim nor does it constitute notice of an intention to do so. On the facts of this case, it is unnecessary to go further and consider what additional actions on the part of HMRC would constitute an enquiry. As earlier mentioned, HMRC does not accept that the UT was right in Portland Gas to hold that HMRC's subsequent actions did constitute an enquiry. I express no view on that question.”