Section 20 consultation is essentially protection for leaseholders so that landlords cannot recover more than a stipulated threshold of service charge monies from an individual without following a certain process. ARMA’s advice booklet explains in more detail. If you want to have the ‘short version’ explained to you (more than understandable!) then feel free to call us. 

https://arma.org.uk/downloader/twg/Section_20_Consultation
_for_Private_Landlords.pdf