In parts of Lancashire, particularly in Burnley and down Rossendale Valley, and round Chorley and Wigan way, the letter R is heavily emphasised, so the final E in Libre gets lost in that, so it’s not so much flat vowels, more elided vowels, almost unvoiced. Where do you fit in?
I can still tell which town folk come from in Lancashire from their accent. Professor Brian Cox has a barely tamed Oldham accent, if you listen carefully. He uses the glottal stop instead of t even before a word starting with a vowel when talking casually.