Listen to this sound clip which is the beginning of a sentence said by a native speaker of General British (the clip is repeated twice); two words are to be heard:
The next section immediately following the one above sounds like this:
Four words are spoken in this 2nd clip.
Finally you can hear the whole sentence:
The rest of the sentence (i.e. the section after the first two snippets) is quite easy to grasp. Let's see if you can decode the beginning.
Thanks to John Maidment, who provided the sound clip.
Solution (in a very moderately narrow transcription): [ðɛwɒz̥təvbiːnəmiːtɪŋðɪsjɪətuː]