That sounds like the glottal stop you hear quite a bit in England. Bu'hu for "butter", wa'hu for "water" and so on. I've been in heated discussions with Englishmen arguing my pronouncing the Ts in the middle of words is incorrect. I personally hold to the notion that at the very least if you go to the length of putting the letter T *twice* in the same spot, it really wants to be pronounced.
That is the rule for RP. Lots of English are afraid of sounding posh and avoid it. Estuary English is what the elite kids speak these days so they can blend in with working class.
