I couldn't see any difference to the original Excel file ....
I've spent about 30 minutes trying different ways of fixing your dates:
See below & attached file
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Nothing I tried worked.
I'm not saying its impossible to fix but I've spent too long on it already
My suggestion is to abandon trying to fix it & re-enter the dates
Insert an extra column in Excel, format it as UK date e.g. dd/mm/yyyy then re-enter the data correctly
Once that is done, delete the original data in column B
Thank you, I tried re-enter the dates and it works perfectly now!