What selection (i) process and (ii) criteria were used by the Castle Control Board to appoint interns, (b) what are the areas of specialisation of each of the current interns, (c) what stipend amount do interns receive, (d) what is the duration of internships, (e) what memorandums of understanding exist with higher education institutions with regard to such internships and (f)(i) how and (ii) when did the Castle Control Board advertise these internships?