Child protection is a high priority for the UK Border & immigration Agency, and UK/Austrian border officials are especially vigilant in the case of minors (i.e. children under 18) travelling on their own or in the company of adults who are not their parents or legal guardians. Carrying such a letter of consent is a precautionary measure recommended by the UK and Austrian authorities. It does not, however, automatically guarantee the problem-free movement of minors who are not travelling with the person legally exercising parental care over them