Best Prime Minister: Opinium
| End Date | Company | Client | CON | LAB | OTH | DK | Lead |
| 30 Apr 2021 | Opinium Online | 32 | 29 | 24 | 14 | +3 | |
| 23 Apr 2021 | Opinium Online | 35 | 25 | 26 | 14 | +9 | |
| 09 Apr 2021 | Opinium Online | 38 | 25 | 22 | 15 | +13 | |
| 26 Mar 2021 | Opinium Online | 33 | 27 | 25 | 15 | +6 | |
| 12 Mar 2021 | Opinium Online | 37 | 25 | 23 | 15 | +12 | |
| 26 Feb 2021 | Opinium Online | 33 | 25 | 27 | 15 | +6 | |
| 12 Feb 2021 | Opinium Online | 32 | 27 | 25 | +5 | ||
| 29 Jan 2021 | Opinium Online | 33 | 29 | 25 | 13 | +4 | |
| 15 Jan 2021 | Opinium Online | 29 | 32 | 25 | 14 | +3 | |
| 07 Jan 2021 | Opinium Online | 32 | 32 | 23 | 13 | Tie | |
| 17 Dec 2020 | Opinium Online | 33 | 31 | 22 | 13 | +2 | |
| 08 Dec 2020 | Opinium Online | 32 | 30 | 23 | 15 | +2 | |
| 04 Dec 2020 | Opinium Online | 32 | 30 | 24 | 14 | +2 | |
| 20 Nov 2020 | Opinium Online | 31 | 30 | 23 | 15 | +1 | |
| 06 Nov 2020 | Opinium Online | 31 | 33 | 23 | 13 | +2 | |
| 23 Oct 2020 | Opinium Online | 30 | 31 | 22 | 16 | +1 | |
| 09 Oct 2020 | Opinium Online | 32 | 33 | 21 | 14 | +1 | |
| 25 Sep 2020 | Opinium Online | 32 | 36 | 17 | 15 | +4 | |
| 11 Sep 2020 | Opinium Online | 33 | 32 | 21 | 14 | +1 | |
| 28 Aug 2020 | Opinium Online | 34 | 32 | 18 | 16 | +2 | |
| 14 Aug 2020 | Opinium Online | 34 | 33 | 19 | 14 | +1 | |
| 31 Jul 2020 | Opinium Online | 35 | 34 | 17 | 14 | +1 | |
| 24 Jul 2020 | Opinium Online | 35 | 33 | 16 | 16 | +2 | |
| 17 Jul 2020 | Opinium Online | 36 | 34 | 17 | 14 | +2 | |
| 10 Jul 2020 | Opinium Online | 36 | 33 | 15 | 16 | +3 | |
| 03 Jul 2020 | Opinium Online | 34 | 33 | 18 | 15 | +1 | |
| 26 Jun 2020 | Opinium Online | 35 | 37 | 14 | 14 | +2 | |
| 19 Jun 2020 | Opinium Online | 35 | 34 | 16 | 15 | +1 | |
| 12 Jun 2020 | Opinium Online | 36 | 35 | 15 | 13 | +1 | |
| 05 Jun 2020 | Opinium Online | 36 | 35 | 16 | 13 | +1 | |
| 29 May 2020 | Opinium Online | 36 | 33 | 17 | 14 | +3 | |
| 22 May 2020 | Opinium Online | 39 | 31 | 14 | 16 | +8 | |
| 14 May 2020 | Opinium Online | 42 | 28 | 15 | 15 | +14 | |
| 07 May 2020 | Opinium Online | 44 | 23 | 16 | 17 | +21 | |
| 01 May 2020 | Opinium Online | 45 | 23 | 15 | 16 | +22 | |
| 23 Apr 2020 | Opinium Online | 44 | 23 | 17 | 16 | +21 | |
| 17 Apr 2020 | Opinium Online | 48 | 22 | 14 | 16 | +26 | |
| 01 Nov 2019 | Opinium Online | Observer | 37 | 18 | 35 | 10 | +2 |
| 25 Oct 2019 | Opinium Online | Observer | 39 | 16 | 35 | 10 | +4 |
| 17 Oct 2019 | Opinium Online | Observer | 36 | 15 | 37 | 11 | +1 |
| 04 Oct 2019 | Opinium Online | Observer | 36 | 16 | 36 | 12 | Tie |
| 27 Sep 2019 | Opinium Online | Observer | 37 | 16 | 40 | 7 | +3 |
| 20 Sep 2019 | Opinium Online | Observer | 36 | 15 | +21 | ||
| 13 Sep 2019 | Opinium Online | Observer | 35 | 16 | 37 | 12 | +2 |
| 23 Aug 2019 | Opinium Online | Observer | 41 | 17 | 34 | 8 | +7 |
| 09 Aug 2019 | Opinium Online | Observer | 38 | 19 | 34 | 9 | +4 |
| 29 Mar 2019 | Opinium Online | Observer | 25 | 18 | 47 | 10 | +22 |
| 22 Mar 2019 | Opinium Online | Observer | 27 | 18 | 44 | 11 | +17 |
| 15 Mar 2019 | Opinium Online | Observer | 29 | 18 | 45 | 8 | +16 |
| 01 Mar 2019 | Opinium Online | Observer | 33 | 18 | 42 | 7 | +9 |
| 22 Feb 2019 | Opinium Online | Observer | 34 | 20 | 38 | 8 | +4 |
| 15 Feb 2019 | Opinium Online | Observer | 30 | 22 | 39 | 9 | +9 |
| 01 Feb 2019 | Opinium Online | Observer | 32 | 20 | 39 | 9 | +7 |
| 18 Jan 2019 | Opinium Online | Observer | 29 | 22 | 40 | 9 | +11 |
| 20 Sep 2018 | Opinium Online | 33 | 23 | 36 | 9 | +3 | |
| 13 Sep 2018 | Opinium Online | 32 | 23 | 35 | 10 | +3 | |
| 17 Aug 2018 | Opinium Online | Observer | 30 | 24 | 46 | +16 | |
| 13 Jul 2018 | Opinium Online | Observer | 29 | 25 | 36 | 10 | +7 |
| 07 Jun 2018 | Opinium Online | 35 | 25 | 29 | 11 | +6 | |
| 16 May 2018 | Opinium Online | Observer | 36 | 23 | 30 | 10 | +6 |
| 12 Apr 2018 | Opinium Online | 36 | 24 | 31 | 9 | +5 | |
| 15 Mar 2018 | Opinium Online | Observer | 34 | 26 | 29 | 11 | +5 |
| 08 Feb 2018 | Opinium Online | Observer | 34 | 28 | 28 | 10 | +6 |
| 12 Jan 2018 | Opinium Online | Observer | 33 | 28 | 29 | 11 | +4 |
| 14 Dec 2017 | Opinium Online | Observer | 34 | 28 | 27 | 11 | +6 |
| 16 Nov 2017 | Opinium Online | Observer | 34 | 29 | 27 | 10 | +5 |
| 06 Oct 2017 | Opinium Online | Observer | 32 | 29 | 28 | 11 | +3 |
| 22 Sep 2017 | Opinium Online | 36 | 26 | 28 | 10 | +8 | |
| 15 Sep 2017 | Opinium Online | Observer | 36 | 28 | 26 | 11 | +8 |
| 18 Aug 2017 | Opinium Online | 34 | 30 | 27 | 9 | +4 | |
| 14 Jul 2017 | Opinium Online | 36 | 33 | 22 | 9 | +3 | |
| 29 Jun 2017 | Opinium Online | Observer | 35 | 34 | 23 | 8 | +1 |