“It is highly dangerous, if not impossible, to attempt to place an accurate definition upon a word in common use; you can look up examples of its many uses if you want to in the Oxford Dictionary but that does not help on definition; in fact it probably only shows that the word normally defies definition. The task of the court in construing statutory language such as that which is before your Lordships is to look at the mischief at which the Act is directed and then, in that light, to consider whether as a matter of common sense and every day usage the known, proved or admitted or properly inferred facts of the particular case bring the case within the ordinary meaning of the words used by Parliament.” 48. That passage in Lord Upjohn’s opinion was cited recently by Upper Tribunal Judge Jacobs in AS v Secretary of State for Work and Pensions (ESA)[2013] UKUT 587 (AAC) where the issue was the meaning of the terms “repeatedly … within a reasonable timescale” in a test of entitlement to a social security benefit. Judge Jacobs held as follows: “19. I am not going to attempt to define what these words mean. That would be wrong. It would be the wrong approach to statutory interpretation and would trespass impermissibly into the role of the First-tier Tribunal. It is not for the Upper Tribunal to give more specific content to the law than the language used in the legislation. The Upper Tribunal will not decide that ‘repeatedly’ means five times, ten times or any other number. Nor will the Upper Tribunal decide that ‘reasonable timescale’ means five seconds, five minutes or any other time.”
"‘Substantial, is a word which has a wide range of meanings. Sometimes it can mean ‘not little’. Sometimes it can mean ‘almost complete’, as in ‘in substantial agreement’. Often it means ‘big’ or ‘solid’, as in a ‘substantial house’. Sometimes it means ‘weighty’ or ‘serious’, as in a "substantial reason"
“[12] Finally, Mr Cornwell asked us to adopt a definition of distress produced by the ICO. This describes it as ‘any injury to feeling, harm or anxiety suffered by an individual’. We doubt the wisdom, for the purposes of applying the statute, in dividing up the phrase ‘substantial distress’ into two words. If the ICO definition involves the proposition that it is not possible to have ‘any injury to feelings’ which falls short of ‘distress’ then, it seems to us, that the definition is at odds with common experience and with the ordinary use of English.” 56. The tribunal later concluded as follows: “ F. Substantial distress [28] The ICO suggests that recipients of the accident claim texts might become concerned for the safety of members of their family or be disturbed by being reminded of a previous accident. Having looked at the wording of the texts, we judge this to be highly unlikely. Almost all mobile phone users, in our judgement, will recognise these texts for what they are. We also regard it as highly unlikely that the texts would evoke distress by raising false expectations of compensation. [29] In our judgement the effect of the contravention is likely to be widespread irritation but not widespread distress. Given the scale of the contravention, there is the possibility of some distress in very unusual circumstances but we cannot construct a logical likelihood of substantial distress as a result of the contravention. We conclude that the contravention is not of a kind likely to cause substantial distress.”