We have produced pdfs and a webmaps of current and historic constituency boundaries.
Another source of maps showing current constituencies is Ordnance Survey's Election Maps website - www.election-maps.co.uk. For more information about maps, including buying maps, see the Maps section of our Frequently Asked Questions.
Select a layer on the webmap to view current and historic boundaries.
You can download shapefiles of each of these sets of constituencies from the Data files page.