However, the Institute for Government has written that the Cabinet Office (of which the Prime Minister's Office is a component) "is a long way from becoming a fully fledged premier's department", primarily based on the fact that the Prime Minister "largely lacks the direct policy responsibilities, either in statute or by convention under the Royal Prerogative, possessed by secretaries of state, who have substantial budgets voted to them by Parliament."
Ent Institute for Government kirjutas, et Cabinet Office (mille osa on peaministri kantselei) "on kaugel sellest, et saada täisvereliseks peaministeeriumiks," põhiliselt sellepärast, et peaministril "suuresti puuduvad otsesed poliitikaga seotud vastutusalad, olgu siis statuudis või konventsiooni järgi kuningliku prerogatiivi all, mis on riigisekretäridel , kellel on substantsiaalsed eelarved, mida parlament neile hääletab."