You can generate a heatmap for any petition by copying its url from the UK Government and Parliament site and pasting it into the entry box in the "Show a different petition" section to the bottom right of the map.

GeoJSON and TopoJSON UK Boundary Data by Martin Chorley is licensed under a Creative Commons Attribution 4.0 International License.

Contains Ordnance Survey, Office of National Statistics and National Records Scotland data © Crown copyright and database right [2017]. Ordnance Survey data covered by OS OpenData Licence.

Contains LPS Intellectual Property Crown copyright and database right [2015]. This information is licensed under the terms of the Open Government Licence.

The estimated (mid-2017) population data for each constituency is sourced from the Northern Ireland Statistics and Research Agency, the National Records of Scotland, and the Office for National Statistics.