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It is. Sort of. That initial batch of data does include differences between adults and non adults who speak English.
More importantly, there is a separate measure on household proficiency. I have that too.
The highest % of houses where English (or Welsh) is not the main language AND where people describe themselves as not speaking English well, is only 9.9% and that is in Leicester.
The numbers for Oldham are only 3.9%
Just because people choose to not speak English, doesn't mean they are unable to speak English.
For the record, because I happen to be using this data right now for work, according to the 2021 Census data, 15.42% of the population i Oldham self identify as living in a household where English is not the primary language.
National average is 10.73%.
Adjusting for skewness, Oldham less than a single standard deviation from the norm. Not really an outlier.
Kensington and Chelsea is at 42.11%. In fact
London Boroughs represent most of the top 25.