Updated numbers here: Burnham bounce still basically entirely coming from clawing back voters Labour had lost to Greens, Lib Dems and Plaid/SNP. In addition, Burnham now winning 10% of Green 2024 voters - double that from June.
Where is the 'Burnham bounce' coming from? So far, it's largely Labour 2024 voters returning to Labour - mostly those 'progressive defectors' who had previously switched to the Greens. Based on 5 polls with headline VI since 20th July (MiC, Delta, YG, Survation).