Hertsmere election polling data - 1983-2019

	A	B	C	D	E	F	G	H	I	J	K
1	Historic data
2		1983*	1987*	1992*	1997*	2001*	2005*	2010*	2015*	2017**	2019**
3	Conservative	53.2	56.60	56.8	44.3	47.8	53.2	56	59.3	61.1	62.5
4	Labour	19.2	19.60	23.7	38.2	36	27.2	18.8	22.4	28.7	21.7
5	Liberal Democrat	25.6	23.80	18.9	12.8	15.2	18.4	17.4	5.5	5.3	12.6
6	Green							1.3		1.9	3.2
7	UKIP				0.9			3.6	12.7	3
8	Independent Communist	2.1
9	Natural Law			0.7	0.4
10	Referendum				3.4
11	Socialist Labour					1	1.2
12	BNP							3
13
14	Boundaries
15	In the 1983-1992 elections, the constituency consisted of the Borough of Hertsmere and the ward of London Colney.
16	For 1997-2019 elections the constituency consisted only of the Borough of Hertsmere.
17	Boundary changes will effect the constituency again from the 2024/25 general election: the Hertsmere Wikipedia entry has some detail on the changes - which reduce the population of the constituency by approximately 7% https://en.wikipedia.org/wiki/Hertsmere_(UK_Parliament_constituency)#From_2023
18
19	2019 General Election
20			Votes**	Vote share**	% change
21	Conservative	Oliver Dowden	32,651.00	62.5	1.4
22	Labour	Holly Kal-Weiss	11,338.00	21.7	-7
23	Liberal Democrat	Stephen Barrett	6,561.00	12.6	7.2
24	Green Party	John Humphries	1,653.00	3.2	1.3
25	Turnout 70.6%
26
27
28	2017 General Election
29			Votes**	Vote share**	% change
30	Conservative	Oliver Dowden	31,928	61.1	1.8
31	Labour	Fiona Smith	14,977	28.7	6.2
32	Liberal Democrat	Joe Jordan	2,794	5.3	-0.2
33	UKIP	David Hoy	1,564	3	-9.7
34	Green Party	Sophie Summerhayes	990	1.9	1.9
35	Turnout 71.2%
36
37
38	2015 General Election
39			Votes*	Vote share*	% change
40	Conservative	Oliver Dowden	29,696	59.3	3.3
41	Labour	Richard Butler	11,235	22.4	3.6
42	Liberal Democrat	Sophie Bowler	2,777	5.5	-11.9
43	UKIP	Frank Ward	6,383	12.7	9.1
44	Turnout 67.9%
45
46
47	2010 General Election
48			Votes*	Vote share*	% change
49	Conservative	James Clappison	26,476	56	2.8
50	Labour	Sam Russell	8,871	18.8	−8.4
51	Liberal Democrat	Anthony Rowlands	8,210	17.4	−1.0
52	UKIP	David Rutter	1,712	3.6
53	BNP	Daniel Seabrook	1,397	3
54	Green	Arjuna Krishna-Das	604	1.3
55	Turnout 64.7%
56
57
58	2005 General Election
59			Votes*	Vote share*	% change
60	Conservative	James Clappison	22,665	53.2	5.4
61	Labour	Kelly Tebb	11,572	27.2	−8.8
62	Liberal Democrats	Jonathan Davies	7,817	18.4	3.2
63	Socialist Labour	James Dry	518	1.2	0.2
64	Turnout 63%
65
66
67	2001 General Election
68			Votes*	Vote share*	% change
69	Conservative	James Clappison	19,855	47.8	3.5
70	Labour	Hilary Broderick	14,953	36	−2.2
71	Liberal Democrats	Paul Thompson	6,300	15.2	2.4
72	Socialist Labour	James Dry	397	1
73	Turnout 60.3%
74
75
76	1997 General Election
77			Votes*	Vote share*	% change
78	Conservative	James Clappison	22,305	44.3	-12.5
79	Labour	Beth Kelly	19,230	38.2	14.5
80	Liberal Democrats	Ann Gray	6,466	12.8	-6.1
81	Referendum	James Marlow	1,703	3.4
82	UKIP	Rodney Saunders	453	0.9
83	Natural Law	Nigel Kahn	191	0.4
84	Turnout 74%
85
86
87	1992 General Election
88			Votes*	Vote share*	% change
89	Conservative	James Clappison	32,133	56.8	0.2
90	Labour	David Souter	13,398	23.7	4.1
91	Liberal Democrats	Zerbanoo Gifford	10,681	18.9	−4.9
92	Natural Law	Diana Harding	373	0.7
93	Turnout 80.9%
94
95
96	1987 General Election
97			Votes*	Vote share*	% change
98	Conservative	Cecil Parkinson	31,278	56.6	3.4
99	Liberal	Laurence Brass	13,172	23.8	-1.8
100	Labour	Frank Ward	10,835	19.6	0.4