I was the Conservative candidate at the 2019 UK general election in the constituency of Alyn & Deeside. I got very close to taking this once-safe, 'Red Wall' seat:
https://www.bbc.co.uk/news/politics/constituencies/W07000043
Result:
Mark Tami (Lab) 18,271 (42.48%, -9.61%)
Sanjoy Sen (C) 18,058 (41.99%, +1.59%)
Simon Wall (Brexit) 2,678 (6.23%)
Donna Lalek (LD) 2,548 (5.92%, +3.52%)
Susan Hills (PC) 1,453 (3.38%, +0.76%)
Majority: 213 (0.50%)
Swing: 5.60% Lab to C
Electorate 62,783; Turnout 43,008 (68.50%, -2.50%)