Hadn't seen that site before, it's always useful having some non-confidential sample data. I ended up writing a macro to generate loads of random sample data as I didn't have anything to work with.
it was my first hit on "excel random data set". I did think about linking to fingertips/phe/ohid/coronavirus datasets but thought it might not be relevant.
Excel jet is great. Really clear and helpful.
Do you want some data to muck around with?
https://www.contextures.com/xlsampledata01.html