Data-mapping experts from UCL's Centre for Advanced Spatial Analysis have mapped the latest proposals for English constituency boundaries, as published yesterday by the Boundary Commission . The new revision would see the number of MPs reduced to 600 from 650, with almost all constituencies comprising between 72,000 and 80,000 voters. The existing layout is shown in red, while proposed boundaries are blue. Use the slider to choose between showing only current constituencies, only the proposed changes, or both in the same view.• Who made this visualisation? James Cheshire and Oliver O'Brien • Where can I find the original? spatialanalysis.co.uk