Here are some links and useful material
Locality
This is a link to a download from the excellent organisation Locality
a PDF file which outlines what a neighbourhood plan is all about and what it’s for.
Neighbourhood Planners London (NPL)
The London Society
The Society is for all those who love London. It was founded in 1912 by a group of eminent Londoners concerned about the lack of planning in the capital. And they do have lovely meetings and presentations.
https://www.londonsociety.org.uk/
Planning Portal
The Planning Portal is pleased to work closely with the following strategic partners to deliver its mission of transforming planning and building.
https://www.planningportal.co.uk/
Royal Town Planning Institute
The Royal Town Planning Institute champions the power of planning in creating prosperous places and vibrant communities. We are a leading membership organisation and a Chartered Institute responsible for maintaining professional standards and accrediting world class planning courses nationally and internationally.
Council Links
Hackney Councils designated the Finsbury Park and Stroud Green Neighbourhood Area and Finsbury Park and Stroud Green Neighbourhood Forum.
Hackney : https://hackney.gov.uk/neighbourhood-planning-decisions
Islington : https://www.islington.gov.uk/planning/neighbourhood-planning