He named most of the major cities in the UK alleging they all have Muslim mayors. People have pointed out that half of them don’t but the sentiment is that Britain has ‘fallen’.
Panorama ran a programme in 2015, where the Post Office threatened to suit them, but it still didn't outrage the public.
https://www.standard.co.uk/news/uk/bbc-post-office-panorama-horizon-scandal-rishi-sunak-london-b1131871.html