I just came across a publication from the Borough of Newham and LCACC.ORG, advising the RJ100 must cease operating from LCY from the 31st of March 2017. Not sure if this will also apply for the RJ85, but can't imagine the noise footprint is that different for the 2 aircraft types.
Source: lcacc.org/wp-content/.../LCACC-Airport-Monitoring-Report-Sept-Dec-2016.docx