Best Prime Minister
| End Date | Company | Client | CON | LAB | OTH | DK | Lead |
| 13 Sep 2018 | YouGov Online | Times | 36 | 23 | 39 | +13 | |
| 04 Sep 2018 | YouGov Online | Times | 34 | 25 | 38 | +9 | |
| 29 Aug 2018 | YouGov Online | Times | 35 | 23 | 39 | +12 | |
| 21 Aug 2018 | YouGov Online | Times | 36 | 23 | 42 | +13 | |
| 17 Aug 2018 | Opinium Online | Obsever | 30 | 24 | 46 | +6 | |
| 14 Aug 2018 | YouGov Online | 35 | 24 | 41 | +11 | ||
| 10 Aug 2018 | BMG Online | 29 | 29 | 42 | Tie | ||
| 09 Aug 2018 | YouGov Online | Times | 36 | 22 | 39 | +14 | |
| 31 Jul 2018 | YouGov Online | Times | 32 | 25 | 40 | +7 | |
| 23 Jul 2018 | YouGov Online | Times | 32 | 26 | 39 | +6 | |
| 17 Jul 2018 | YouGov Online | Times | 33 | 25 | 38 | +8 | |
| 13 Jul 2018 | Opinium Online | Obsever | 29 | 25 | 36 | 10 | +7 |
| 09 Jul 2018 | YouGov Online | Times | 34 | 27 | 36 | +7 | |
| 05 Jul 2018 | BMG Online | 35 | 28 | 36 | +7 | ||
| 04 Jul 2018 | YouGov Online | Times | 35 | 25 | 37 | +10 | |
| 26 Jun 2018 | YouGov Online | Times | 38 | 26 | 34 | +12 | |
| 19 Jun 2018 | YouGov Online | Times | 38 | 26 | 34 | +12 | |
| 12 Jun 2018 | YouGov Online | Times | 39 | 24 | 37 | +15 | |
| 07 Jun 2018 | Opinium Online | 35 | 25 | 29 | 11 | +6 | |
| 05 Jun 2018 | YouGov Online | Times | 37 | 24 | 37 | +13 | |
| 29 May 2018 | YouGov Online | Times | 38 | 27 | 35 | +11 | |
| 21 May 2018 | YouGov Online | Times | 37 | 27 | 35 | +10 | |
| 16 May 2018 | Opinium Online | Obsever | 36 | 23 | 30 | 10 | +6 |
| 14 May 2018 | YouGov Online | Times | 40 | 25 | 35 | +15 | |
| 09 May 2018 | YouGov Online | Times | 39 | 25 | 36 | +14 | |
| 01 May 2018 | YouGov Online | Times | 37 | 27 | 36 | +10 | |
| 17 Apr 2018 | YouGov Online | Times | 39 | 25 | 35 | +14 | |
| 14 Apr 2018 | Survation Online | Mail on Sunday | 43 | 30 | 28 | +13 | |
| 12 Apr 2018 | Opinium Online | 36 | 24 | 31 | 9 | +5 | |
| 10 Apr 2018 | YouGov Online | Times | 37 | 26 | 37 | +11 | |
| 05 Apr 2018 | YouGov Online | Times | 39 | 26 | 35 | +13 | |
| 27 Mar 2018 | YouGov Online | Times | 38 | 27 | 35 | +11 | |
| 15 Mar 2018 | Opinium Online | Observer | 34 | 26 | 29 | 11 | +5 |
| 06 Mar 2018 | YouGov Online | Times | 36 | 29 | 35 | +7 | |
| 27 Feb 2018 | YouGov Online | Times | 36 | 30 | 33 | +6 | |
| 20 Feb 2018 | YouGov Online | Times | 36 | 29 | 35 | +7 | |
| 13 Feb 2018 | YouGov Online | Times | 36 | 29 | 35 | +7 | |
| 09 Feb 2018 | BMG Online | 32 | 30 | 38 | +2 | ||
| 08 Feb 2018 | Opinium Online | Observer | 34 | 28 | 28 | 10 | +6 |
| 06 Feb 2018 | YouGov Online | Times | 37 | 29 | 33 | +8 | |
| 29 Jan 2018 | YouGov Online | Times | 35 | 29 | 36 | +6 | |
| 17 Jan 2018 | YouGov Online | Times | 36 | 31 | 33 | +5 | |
| 12 Jan 2018 | Opinium Online | Observer | 33 | 28 | 29 | 11 | +4 |
| 08 Jan 2018 | YouGov Online | Times | 37 | 31 | 31 | +6 | |
| 20 Dec 2017 | YouGov Online | Times | 37 | 31 | 32 | +6 | |
| 14 Dec 2017 | Opinium Online | Observer | 34 | 28 | 27 | 11 | +6 |
| 10 Dec 2017 | YouGov Online | Times | 37 | 28 | 35 | +9 | |
| 08 Dec 2017 | BMG Online | 32 | 33 | 38 | +1 | ||
| 05 Dec 2017 | YouGov Online | Times | 34 | 30 | 36 | +4 | |
| 01 Dec 2017 | ICM Online | Guardian | 40 | 32 | 28 | +8 | |
| 16 Nov 2017 | Opinium Online | 14–16 Nov | 34 | 29 | 27 | 10 | +5 |
| 08 Nov 2017 | YouGov Online | 7–8 Nov | 34 | 31 | 35 | +3 | |
| 11 Oct 2017 | YouGov Online | Times | 33 | 33 | 35 | Tie | |
| 08 Oct 2017 | ICM Online | Guardian | 41 | 32 | 27 | +9 | |
| 06 Oct 2017 | Opinium Online | Observer | 32 | 29 | 28 | 11 | +3 |
| 05 Oct 2017 | YouGov Online | Times | 36 | 33 | 32 | +3 | |
| 29 Sep 2017 | BMG Online | Independent | 30 | 32 | 38 | +2 | |
| 24 Sep 2017 | YouGov Online | Times | 37 | 29 | 33 | +8 | |
| 22 Sep 2017 | Opinium Online | 36 | 26 | 28 | 10 | +8 | |
| 18 Sep 2017 | Ipsos MORI Phone | 45 | 38 | 10 | 6 | +7 | |
| 15 Sep 2017 | Opinium Online | Observer | 36 | 28 | 26 | 11 | +8 |
| 31 Aug 2017 | YouGov Online | Times | 37 | 32 | 31 | +5 | |
| 22 Aug 2017 | YouGov Online | Times | 37 | 33 | 31 | +4 | |
| 18 Aug 2017 | Opinium Online | 34 | 30 | 27 | 9 | +4 | |
| 11 Aug 2017 | BMG Online | Independent | 32 | 33 | 33 | +1 | |
| 01 Aug 2017 | YouGov Online | Times | 37 | 32 | 30 | +5 | |
| 19 Jul 2017 | YouGov Online | Times | 37 | 32 | 30 | +5 | |
| 18 Jul 2017 | Ipsos MORI Phone | 46 | 38 | 10 | 6 | +8 | |
| 15 Jul 2017 | Survation Online | Mail on Sunday | 43 | 35 | 21 | +8 | |
| 14 Jul 2017 | Opinium Online | 36 | 33 | 22 | 9 | +3 | |
| 11 Jul 2017 | YouGov Online | Times | 38 | 33 | 29 | +5 | |
| 30 Jun 2017 | Survation Phone | 44 | 38 | 19 | +6 | ||
| 29 Jun 2017 | Opinium Online | Observer | 35 | 34 | 23 | 8 | +1 |
| 22 Jun 2017 | YouGov Online | Times | 34 | 35 | 30 | +1 | |
| 10 Jun 2017 | YouGov Online | Times | 39 | 39 | 22 | Tie |