| Survation | 2020-12-10 | | 39 | 37 | 8 | 5 | 5 | 1 |
| Opinium | 2020-11-20 | | 41 | 38 | 6 | 6 | 4 | 1 |
| Survation | 2020-11-06 | | 39 | 37 | 9 | 5 | 4 | 0 |
| Opinium | 2020-11-06 | | 38 | 42 | 7 | 5 | 3 | 1 |
| Yougov | 2020-11-05 | | 35 | 40 | 7 | 5 | 4 | 1 |
| Ipsos Mori | 2020-10-28 | | 37 | 42 | 8 | 5 | 5 | 1 |
| Redfield and Wilton Strategies | 2020-10-28 | | 39 | 41 | 7 | 4 | 4 | 0 |
| SavantaComRes | 2020-10-26 | | 42 | 39 | 7 | 4 | 3 | 0 |
| DeltaPoll | 2020-10-24 | | 42 | 39 | 7 | 3 | 3 | 0 |
| Opinium | 2020-10-23 | | 38 | 40 | 6 | 5 | 5 | 1 |
| Opinium | 2020-10-09 | | 40 | 40 | 6 | 6 | 3 | 1 |
| Yougov | 2020-10-07 | | 41 | 38 | 5 | 5 | 6 | 1 |
| Survation | 2020-10-06 | | 41 | 37 | 7 | 4 | 4 | 1 |
| Yougov | 2020-09-30 | | 39 | 39 | 6 | 5 | 5 | 1 |
| Opinium | 2020-09-25 | | 39 | 42 | 5 | 6 | 4 | 1 |
| DeltaPoll | 2020-09-25 | | 42 | 38 | 6 | 5 | 5 | 0 |
| Yougov | 2020-09-24 | | 42 | 38 | 6 | 4 | 5 | 1 |
| Redfield and Wilton Strategies | 2020-09-23 | | 40 | 40 | 7 | 4 | 5 | 0 |
| Kantar | 2020-09-21 | | 40 | 38 | 9 | 4 | 4 | 1 |
| Yougov | 2020-09-17 | | 40 | 40 | 6 | 4 | 5 | 1 |
| Survation | 2020-09-16 | | 40 | 38 | 7 | 5 | 4 | 1 |
| Redfield and Wilton Strategies | 2020-09-15 | | 41 | 39 | 8 | 5 | 5 | 0 |
| Opinium | 2020-09-11 | | 42 | 40 | 6 | 5 | 4 | 1 |
| Survation | 2020-09-04 | | 40 | 38 | 8 | 5 | 4 | 1 |
| Redfield and Wilton Strategies | 2020-09-02 | | 43 | 37 | 8 | 4 | 4 | 0 |
| Opinium | 2020-08-28 | | 40 | 40 | 6 | 6 | 3 | 0 |
| Yougov | 2020-08-25 | | 43 | 36 | 6 | 6 | 4 | 1 |
| Redfield and Wilton Strategies | 2020-08-24 | | 42 | 37 | 9 | 4 | 5 | 0 |
| Survation | 2020-08-21 | | 41 | 37 | 9 | 5 | 4 | 0 |
| Yougov | 2020-08-19 | | 40 | 38 | 6 | 5 | 6 | 1 |
| Redfield and Wilton Strategies | 2020-08-19 | | 44 | 37 | 7 | 4 | 4 | 0 |
| SavantaComRes | 2020-08-16 | | 42 | 37 | 7 | 4 | 3 | 1 |
| Opinium | 2020-08-14 | | 42 | 39 | 5 | 5 | 4 | 1 |
| Redfield and Wilton Strategies | 2020-08-12 | | 43 | 36 | 9 | 4 | 4 | 0 |
| Yougov | 2020-08-12 | | 44 | 35 | 5 | 6 | 5 | 1 |
| Yougov | 2020-08-05 | | 42 | 36 | 8 | 5 | 5 | 1 |
| Ipsos Mori | 2020-08-04 | | 45 | 37 | 6 | 5 | 5 | 1 |
| Survation | 2020-08-03 | | 44 | 35 | 8 | 4 | 5 | 0 |
| Opinium | 2020-07-31 | | 41 | 38 | 6 | 6 | 4 | 1 |
| Yougov | 2020-07-31 | | 43 | 35 | 6 | 5 | 5 | 1 |
| Redfield and Wilton Strategies | 2020-07-29 | | 43 | 38 | 7 | 4 | 4 | 0 |
| Opinium | 2020-07-24 | | 42 | 38 | 6 | 5 | 5 | 1 |
| Redfield and Wilton Strategies | 2020-07-22 | | 44 | 36 | 8 | 4 | 5 | 1 |
| SavantaComRes | 2020-07-19 | | 43 | 37 | 6 | 5 | 2 | 1 |
| Opinium | 2020-07-17 | | 44 | 36 | 6 | 6 | 4 | 1 |
| Redfield and Wilton Strategies | 2020-07-15 | | 44 | 37 | 8 | 4 | 4 | 0 |
| Kantar | 2020-07-13 | | 45 | 35 | 9 | 5 | 2 | 1 |
| Survation | 2020-07-12 | | 42 | 36 | 8 | 4 | 5 | 0 |
| Opinium | 2020-07-10 | | 42 | 38 | 6 | 6 | 4 | 1 |
| Yougov | 2020-07-09 | | 46 | 36 | 6 | 5 | 3 | 0 |
| Redfield and Wilton Strategies | 2020-07-08 | | 44 | 39 | 7 | 4 | 4 | 0 |
| Survation | 2020-07-06 | | 44 | 37 | 7 | 4 | 4 | 0 |
| Opinium | 2020-07-03 | | 41 | 37 | 8 | 5 | 4 | 1 |
| Redfield and Wilton Strategies | 2020-07-01 | | 42 | 38 | 8 | 4 | 5 | 0 |
| Opinium | 2020-06-26 | | 43 | 39 | 6 | 5 | 4 | 1 |
| Redfield and Wilton Strategies | 2020-06-25 | | 44 | 38 | 7 | 4 | 4 | 0 |
| Survation | 2020-06-25 | | 43 | 36 | 8 | 5 | 4 | 0 |
| Opinium | 2020-06-19 | | 44 | 40 | 5 | 5 | 3 | 1 |
| Redfield and Wilton Strategies | 2020-06-18 | | 43 | 38 | 8 | 4 | 4 | 0 |
| Kantar | 2020-06-15 | | 43 | 35 | 8 | 5 | 4 | 0 |
| SavantaComRes | 2020-06-14 | | 40 | 36 | 9 | 5 | 3 | 1 |
| Opinium | 2020-06-12 | | 44 | 39 | 6 | 5 | 2 | 0 |
| Yougov | 2020-06-12 | | 45 | 37 | 6 | 5 | 4 | 1 |
| Redfield and Wilton Strategies | 2020-06-11 | | 41 | 39 | 9 | 5 | 4 | 0 |
| Survation | 2020-06-10 | | 42 | 36 | 8 | 5 | 4 | 0 |
| Ipsos Mori | 2020-06-10 | | 43 | 38 | 10 | 4 | 3 | 1 |
| Opinium | 2020-06-05 | | 43 | 40 | 6 | 5 | 3 | 0 |
| DeltaPoll | 2020-06-05 | | 41 | 38 | 8 | 2 | 4 | 0 |
| Redfield and Wilton Strategies | 2020-06-03 | | 43 | 36 | 9 | 4 | 5 | 1 |
| Survation | 2020-06-03 | | 41 | 39 | 7 | 4 | 4 | 1 |
| Yougov | 2020-05-30 | | 45 | 35 | 6 | 5 | 5 | 0 |
| Opinium | 2020-05-29 | | 43 | 39 | 6 | 5 | 3 | 1 |
| DeltaPoll | 2020-05-28 | | 43 | 38 | 8 | 3 | 4 | 0 |
| Redfield and Wilton Strategies | 2020-05-27 | | 43 | 37 | 9 | 5 | 3 | 0 |
| Yougov | 2020-05-27 | | 43 | 38 | 6 | 5 | 4 | 1 |
| Survation | 2020-05-26 | | 46 | 33 | 8 | 5 | 4 | 0 |
| Yougov | 2020-05-26 | | 44 | 38 | 6 | 5 | 4 | 1 |
| Opinium | 2020-05-22 | | 47 | 35 | 6 | 5 | 3 | 0 |
| Yougov | 2020-05-19 | | 48 | 33 | 6 | 5 | 5 | 1 |
| SavantaComRes | 2020-05-17 | | 46 | 33 | 7 | 4 | 4 | 0 |
| Redfield and Wilton Strategies | 2020-05-15 | | 47 | 35 | 9 | 4 | 3 | 0 |
| Opinium | 2020-05-14 | | 49 | 34 | 6 | 5 | 3 | 1 |
| Opinium | 2020-05-13 | | 49 | 34 | 6 | 5 | 3 | 1 |
| Kantar | 2020-05-11 | | 51 | 32 | 7 | 5 | 2 | 1 |
| Opinium | 2020-05-07 | | 49 | 33 | 6 | 5 | 5 | 1 |
| Redfield and Wilton Strategies | 2020-05-06 | | 50 | 31 | 7 | 4 | 5 | 0 |
| Yougov | 2020-05-06 | | 50 | 30 | 7 | 4 | 5 | 1 |
| Opinium | 2020-05-01 | | 51 | 33 | 6 | 5 | 3 | 1 |
| Survation | 2020-04-28 | | 48 | 31 | 8 | 4 | 5 | 1 |
| Redfield and Wilton Strategies | 2020-04-26 | | 50 | 33 | 7 | 5 | 4 | 0 |
| Opinium | 2020-04-23 | | 50 | 33 | 7 | 5 | 3 | 0 |
| Kantar | 2020-04-20 | | 54 | 28 | 9 | 4 | 4 | 1 |
| Opinium | 2020-04-17 | | 51 | 32 | 6 | 5 | 3 | 0 |
| Redfield and Wilton Strategies | 2020-04-17 | | 52 | 31 | 8 | 4 | 3 | 1 |
| Yougov | 2020-04-17 | | 53 | 32 | 5 | 4 | 3 | 1 |
| Opinium | 2020-04-09 | | 55 | 29 | 5 | 5 | 4 | 0 |
| BMG Research | 2020-04-09 | | 46 | 29 | 10 | 3 | 6 | 1 |
| Opinium | 2020-04-03 | | 53 | 30 | 7 | 5 | 3 | 1 |
| Yougov | 2020-04-02 | | 52 | 28 | 8 | 5 | 5 | 1 |
| Redfield and Wilton Strategies | 2020-04-02 | | 49 | 29 | 8 | 4 | 4 | 1 |
| Opinium | 2020-03-27 | | 54 | 28 | 6 | 5 | 3 | 1 |
| Number Cruncher Politics | 2020-03-26 | | 54 | 28 | 7 | 4 | 4 | 0 |
| Redfield and Wilton Strategies | 2020-03-23 | | 47 | 29 | 8 | 5 | 5 | 1 |
| Ipsos Mori | 2020-03-22 | | 43 | 38 | 10 | 4 | 3 | 0 |
| Opinium | 2020-03-20 | | 51 | 31 | 7 | 5 | 3 | 1 |
| Ipsos Mori | 2020-03-16 | | 52 | 30 | 9 | 4 | 4 | 1 |
| Opinium | 2020-03-13 | | 49 | 32 | 6 | 5 | 5 | 1 |
| Kantar | 2020-03-09 | | 50 | 29 | 11 | 4 | 2 | 1 |
| BMG Research | 2020-03-06 | | 45 | 28 | 11 | 3 | 6 | 1 |
| SavantaComRes | 2020-02-20 | | 47 | 31 | 9 | 4 | 4 | 1 |
| Opinium | 2020-02-14 | | 47 | 31 | 7 | 6 | 4 | 1 |
| Redfield and Wilton Strategies | 2020-02-12 | | 49 | 31 | 9 | 4 | 4 | 1 |
| Yougov | 2020-02-10 | | 48 | 28 | 10 | 4 | 6 | 1 |
| BMG Research | 2020-02-07 | | 41 | 29 | 11 | 5 | 8 | 1 |
| Ipsos Mori | 2020-02-03 | | 47 | 30 | 11 | 4 | 5 | 1 |
| Yougov | 2020-02-02 | | 49 | 30 | 8 | 4 | 5 | 1 |
| Survation | 2020-01-31 | | 44 | 33 | 10 | 5 | 3 | 0 |
| Yougov | 2020-01-26 | | 49 | 29 | 10 | 5 | 4 | 1 |
| Opinium | 2020-01-17 | | 47 | 30 | 9 | 5 | 4 | 1 |
| BMG Research | 2020-01-10 | | 44 | 29 | 11 | 3 | 5 | 0 |