A word that ends with the-l options l and it is in the UK will have to double as one l syllable, regardless of whether or not they have been stressing it will fill-ed or-ing but in America would double the l when a heavy syllable accented syllables.
Words ending with l-l and the pages are located in England, will have one double l whether the syllable is stressed or not. Then fill-ed or-ing, but in America will double l when the syllable is the stressed syllable only.
Words ending in - L and face that is l pool in England will have to double L one, whether trying to focus or Inc, then to fill. - ed or - ing but in America will double L when syllables are syllables stressed.