Glottalisation

Existence of a glottal plosive in non-RP accents of English is well-known and much researched. It is often fondly supposed that this does not occur in RP. However, whilst it is true that, at least at present,  does not occur in RP intervocalically within a word (Ramsaran 1990: 181), it is to be encountered elsewhere.

RP glottaling is most associated with /t/. Whilst it might be avoided in careful speech and is less likely to be heard in citation forms than in conversation, it is quite regularly to be expected in RP in syllable-final position preceding a non-syllabic consonant, as rat trap, postbox, tentpeg, catflap, Rottweiler. Like Gatwick, which regularly exhibits the glottal, another of London’s airports, Luton, is also increasingly to be heard pronounced with  preceding a syllabic /n/.

 is frequently to be heard intervocalically at a syllable boundary, where the second syllable is stressed, giving  re-entrant,  de-activate. Trad-RP makes use of this device too in the break or hiatus created by the avoidance of intrusive /r/, as in drawing, law and order.