Mangeled from those two maps from the Guardian.
I’ve overlaid the 2017 general election over the 2016 Brexit vote maps. The constituencies and voting areas weren’t quite the same and so the UK proportions are different between the two maps. I’ve distorted the shape of the general election map so it fits better over the Brexit map but it doesn’t always quite fit.
Ignore Scotland and Northern Ireland (at your peril normally but in this case because they have theor own colour scheme). In England and Wales, unambiguously blue regions are Tory areas that also voted to Leave. Orange areas are not a DUP takeover of the mainland but Labour areas that voted to Remain. Purply-red areas are Labour areas that voted to Leave. Greenish areas are Tory areas that voted to Remain.