“So, either they will have more Delta cases in the coming weeks or they are ignoring covid”
Or, they just have fewer cases. Have a look here and look at positivity rates and number of tests per confirmed case (and indeed, all the other data sets). France does 70 tests per confirmed case and the UK 30. Looked at it that way you could say France is overtesting compared to UK. The positivity rate is 1.4% in France and 3.3% in UK and 7.5% in Germany.