Interestingly, while we were all getting caught up in the national polling and it’s influence on Uxbridge, we did actually get a proper London poll (not just subsample) in early July and low and behold, the swing from 2019 was 7%.
Just out of interest I also looked at the Welsh and Scottish polling. Both also have a lower swing than national polling though in Wales the Tories would still only retain 6 seats with an 8.5% swing against them.
Scotland is the very interesting one because while there’s a large swing to Labour (9.5% against the Tories, 11% against the SNP), universal swing would actually produce an average 1.5% swing from SNP to Tory (they are losing more than the Tories - SNP could lose 14-17 seats in total).