ATSIN 114 which deals with the subject states that :-
Where specific CAA dispensation has been granted at certain UK aerodromes, QNH need not be included in this transmission when it has been passed at an earlier stage in the approach.
Interestingly enough, the latest version of MATS Pt1, dated after ATSIN 114, still includes the old phraseology, which stated that QNH and Threshold Elevation should be passed. Confusing!