'Unconscionable means "completely unreasonable" or "unreasonably excessive" and in so considering HMRC must assess the behaviour of the Appellant as to whether it is what might be expected from any reasonable person in a similar situation.'
"The court is entitled to investigate the action of the [decision-maker] with a view to seeing whether they have taken into account matters which they ought not to take into account, or, conversely, have refused to take into account or neglected to take into account matters which they ought to take into account..."