Westminster Voting Intention: ICM
| End Date | Company | Client | CON | LAB | LD | GRN | UKIP | Lead |
| 18 Jan 2019 | ICM Online | 39 | 40 | 9 | 3 | 5 | +1 | |
| 28 Oct 2018 | ICM Online | 40 | 38 | 9 | 3 | 5 | +2 | |
| 24 Sep 2018 | ICM Online | Guardian | 41 | 40 | 9 | 3 | 4 | +1 |
| 09 Sep 2018 | ICM Online | Guardian | 42 | 39 | 8 | 3 | 4 | +3 |
| 19 Aug 2018 | ICM Online | Guardian | 40 | 40 | 8 | 2 | 6 | Tie |
| 05 Aug 2018 | ICM Online | 39 | 40 | 7 | 3 | 6 | +1 | |
| 22 Jul 2018 | ICM Online | Guardian | 40 | 41 | 8 | 3 | 5 | +1 |
| 09 Jul 2018 | ICM Online | Guardian | 41 | 39 | 9 | 3 | 4 | +2 |
| 24 Jun 2018 | ICM Online | Guardian | 41 | 40 | 9 | 3 | 3 | +1 |
| 10 Jun 2018 | ICM Online | Guardian | 42 | 40 | 8 | 3 | 3 | +2 |
| 29 May 2018 | ICM Online | Guardian | 43 | 40 | 8 | 2 | 3 | +3 |
| 13 May 2018 | ICM Online | Guardian | 43 | 40 | 8 | 3 | 3 | +3 |
| 29 Apr 2018 | ICM Online | Guardian | 42 | 39 | 8 | 3 | 4 | +3 |
| 08 Apr 2018 | ICM Online | Guardian | 42 | 41 | 7 | 3 | 4 | +1 |
| 18 Mar 2018 | ICM Online | Guardian | 44 | 41 | 8 | 2 | 1 | +3 |
| 04 Mar 2018 | ICM Online | Guardian | 43 | 42 | 7 | 3 | 2 | +1 |
| 19 Feb 2018 | ICM Online | Guardian | 42 | 43 | 7 | 2 | 3 | +1 |
| 04 Feb 2018 | ICM Online | Guardian | 41 | 40 | 8 | 3 | 4 | +1 |
| 19 Jan 2018 | ICM Online | Guardian | 41 | 41 | 7 | 3 | 4 | Tie |
| 14 Jan 2018 | ICM Online | Guardian | 40 | 41 | 7 | 3 | 4 | +1 |
| 14 Dec 2017 | ICM Online | Guardian | 41 | 42 | 7 | 3 | 4 | +1 |
| 10 Dec 2017 | ICM Online | Guardian | 42 | 40 | 8 | 2 | 5 | +2 |
| 01 Dec 2017 | ICM Online | Guardian | 40 | 41 | 8 | 3 | 4 | +1 |
| 26 Nov 2017 | ICM Online | Guardian | 41 | 41 | 7 | 3 | 5 | Tie |
| 12 Nov 2017 | ICM Online | Guardian | 41 | 41 | 7 | 2 | 4 | Tie |
| 23 Oct 2017 | ICM Online | Guardian | 42 | 42 | 7 | 2 | 3 | Tie |
| 08 Oct 2017 | ICM Online | Guardian | 41 | 41 | 7 | 2 | 4 | Tie |
| 24 Sep 2017 | ICM Online | Guardian | 40 | 42 | 8 | 2 | 4 | +2 |
| 10 Sep 2017 | ICM Online | Guardian | 42 | 42 | 7 | 3 | 4 | Tie |
| 28 Aug 2017 | ICM Online | Guardian | 42 | 42 | 7 | 3 | 3 | Tie |
| 16 Jul 2017 | ICM Online | Guardian | 42 | 43 | 7 | 2 | 3 | +1 |
| 03 Jul 2017 | ICM Online | Guardian | 41 | 43 | 7 | 3 | 3 | +2 |
| 07 Jun 2017 | ICM Online | Guardian | 46 | 34 | 7 | 2 | 5 | +12 |
| 04 Jun 2017 | ICM Online | Guardian | 45 | 34 | 8 | 3 | 5 | +11 |
| 01 Jun 2017 | ICM Online | Sun | 45 | 34 | 9 | 3 | 5 | +11 |
| 29 May 2017 | ICM Online | Guardian | 45 | 33 | 8 | 3 | 5 | +12 |
| 26 May 2017 | ICM Online | Sun | 46 | 32 | 8 | 2 | 5 | +14 |
| 21 May 2017 | ICM Online | Guardian | 47 | 33 | 9 | 2 | 4 | +14 |
| 14 May 2017 | ICM Online | Guardian | 48 | 28 | 10 | 3 | 6 | +20 |
| 07 May 2017 | ICM Online | Guardian | 49 | 27 | 9 | 3 | 6 | +22 |
| 05 May 2017 | ICM Online | Sun | 46 | 28 | 10 | 4 | 8 | +18 |
| 02 May 2017 | ICM Online | Guardian | 47 | 28 | 8 | 4 | 8 | +19 |
| 28 Apr 2017 | ICM Online | Sun | 47 | 28 | 9 | 4 | 8 | +19 |
| 24 Apr 2017 | ICM Online | Guardian | 48 | 27 | 10 | 3 | 7 | +21 |
| 21 Apr 2017 | ICM Online | Peston on Sunday | 48 | 26 | 10 | 3 | 8 | +22 |
| 18 Apr 2017 | ICM Online | Guardian | 46 | 25 | 11 | 4 | 8 | +21 |
| 02 Apr 2017 | ICM Online | Guardian | 43 | 25 | 11 | 4 | 11 | +18 |
| 19 Mar 2017 | ICM Online | Guardian | 45 | 26 | 9 | 4 | 10 | +19 |
| 05 Mar 2017 | ICM Online | Guardian | 44 | 28 | 8 | 5 | 11 | +16 |
| 19 Feb 2017 | ICM Online | Guardian | 44 | 26 | 8 | 4 | 13 | +18 |
| 05 Feb 2017 | ICM Online | Guardian | 42 | 27 | 10 | 4 | 12 | +15 |
| 22 Jan 2017 | ICM Online | Guardian | 42 | 26 | 10 | 5 | 13 | +16 |
| 08 Jan 2017 | ICM Online | Guardian | 42 | 28 | 9 | 4 | 12 | +14 |
| 11 Dec 2016 | ICM Online | Guardian | 41 | 27 | 9 | 3 | 14 | +14 |
| 27 Nov 2016 | ICM Online | Guardian | 44 | 28 | 7 | 4 | 12 | +16 |
| 20 Nov 2016 | ICM Online | Guardian | 42 | 28 | 9 | 3 | 11 | +14 |
| 30 Oct 2016 | ICM Online | Guardian | 43 | 27 | 8 | 5 | 12 | +16 |
| 09 Oct 2016 | ICM Online | Guardian | 43 | 26 | 8 | 6 | 11 | +17 |
| 23 Sep 2016 | ICM Online | Sun on Sunday | 41 | 26 | 8 | 4 | 14 | +15 |
| 11 Sep 2016 | ICM Online | Guardian | 41 | 28 | 9 | 4 | 13 | +13 |
| 28 Aug 2016 | ICM Online | Guardian | 41 | 27 | 9 | 4 | 13 | +14 |
| 15 Aug 2016 | ICM Online | 40 | 28 | 8 | 4 | 14 | +12 | |
| 24 Jul 2016 | ICM Online | 43 | 27 | 8 | 4 | 13 | +16 | |
| 15 Jul 2016 | ICM Online | Sun on Sunday | 39 | 29 | 9 | 4 | 14 | +10 |
| 10 Jul 2016 | ICM Online | Guardian | 38 | 30 | 8 | 4 | 15 | +8 |
| 03 Jul 2016 | ICM Online | Guardian | 37 | 30 | 8 | 4 | 15 | +7 |
| 26 Jun 2016 | ICM Online | Guardian | 36 | 32 | 7 | 5 | 15 | +4 |
| 13 Jun 2016 | ICM Online | Guardian | 34 | 30 | 8 | 4 | 19 | +4 |
| 13 Jun 2016 | ICM Phone | Guardian | 34 | 33 | 9 | 5 | 14 | +1 |
| 30 May 2016 | ICM Online | Guardian | 36 | 31 | 7 | 4 | 17 | +5 |
| 29 May 2016 | ICM Phone | Guardian | 36 | 32 | 7 | 3 | 15 | +4 |
| 15 May 2016 | ICM Online | Guardian | 34 | 32 | 7 | 4 | 17 | +2 |
| 15 May 2016 | ICM Phone | Guardian | 36 | 34 | 7 | 4 | 13 | +2 |
| 17 Apr 2016 | ICM Phone | Guardian | 38 | 33 | 7 | 3 | 13 | +5 |
| 17 Apr 2016 | ICM Online | Guardian | 36 | 31 | 7 | 4 | 16 | +5 |
| 13 Mar 2016 | ICM Phone | Guardian | 36 | 36 | 8 | 3 | 11 | Tie |
| 14 Feb 2016 | ICM Phone | Guardian | 39 | 32 | 7 | 4 | 11 | +7 |
| 17 Jan 2016 | ICM | Guardian | 40 | 35 | 6 | 3 | 10 | +5 |
| 20 Dec 2015 | ICM | Guardian | 39 | 34 | 7 | 3 | 10 | +5 |
| 15 Nov 2015 | ICM | Guardian | 39 | 33 | 7 | 3 | 12 | +6 |
| 11 Oct 2015 | ICM | Guardian | 38 | 34 | 7 | 3 | 11 | +4 |
| 13 Sep 2015 | ICM | Guardian | 38 | 32 | 8 | 3 | 13 | +6 |
| 09 Aug 2015 | ICM | Guardian | 40 | 31 | 7 | 4 | 10 | +9 |
| 12 Jul 2015 | ICM | Guardian | 38 | 34 | 6 | 4 | 13 | +4 |
| 14 Jun 2015 | ICM | Guardian | 37 | 31 | 8 | 5 | 13 | +6 |
| 06 May 2015 | ICM | Guardian | 34 | 35 | 9 | 4 | 11 | +1 |
| 26 Apr 2015 | ICM | Guardian | 35 | 32 | 9 | 5 | 13 | +3 |
| 19 Apr 2015 | ICM | Guardian | 34 | 32 | 10 | 5 | 11 | +2 |
| 12 Apr 2015 | ICM | Guardian | 39 | 33 | 8 | 7 | 7 | +6 |
| 15 Mar 2015 | ICM | Guardian | 36 | 35 | 8 | 4 | 9 | +1 |
| 15 Feb 2015 | ICM | Guardian | 36 | 32 | 10 | 7 | 9 | +4 |
| 19 Jan 2015 | ICM | Guardian | 30 | 33 | 11 | 9 | 11 | +3 |
| 16 Dec 2014 | ICM | Guardian | 28 | 33 | 14 | 5 | 14 | +5 |
| 09 Nov 2014 | ICM | Guardian | 31 | 32 | 11 | 6 | 14 | +1 |
| 12 Oct 2014 | ICM | Guardian | 31 | 35 | 11 | 4 | 14 | +4 |
| 14 Sep 2014 | ICM | Guardian | 33 | 35 | 10 | 9 | +2 | |
| 10 Aug 2014 | ICM | Guardian | 31 | 38 | 12 | 10 | +7 | |
| 13 Jul 2014 | ICM | Guardian | 34 | 33 | 12 | 9 | +1 | |
| 15 Jun 2014 | ICM | Guardian | 31 | 32 | 10 | 16 | +1 | |
| 11 May 2014 | ICM | Guardian | 33 | 31 | 13 | 15 | +2 |