The 'period of stabilsed flight' (ie established on LLZ) prior to glidepath intercept varies with aircraft category and closing heading and is a UK CAA and ICAO requirement. I admit I'm a bit out of it now but in my recollection it is a minimum of 2nm.
No UK ILS procedure is authorised for glidepath intercept from above and if it happens to you, then report it to CAA or CHIRP.