NETWORKDAYS with filtered column of dates

Hello Wonderful Community and a Happy Monday to you all,

Hopefully a fairly quick and simple question for you here. I'm pretty excited about NETWORKDAYS hitting Power BI and so was hoping to use it in combination with a UK .gov API of Holidays. 

I've succesfully pulled in the table from the API and placed a few filters on it to get just this year's Bank Holidays, and thought I'd test NETWORKDAYS in the run-up to Christmas (on the hottest day ever!). 

As per https://hello-safe.co.uk/business-insurance/tools/working-days-calculator, I'm expecting the result of 114 for England and Wales and 113 for Scotland. 

As per the documentation, I'm using the following for my DAX column; 

daysToChristmas = 
VAR _BankHolidays = {'bank-holidays'[events.date]}
RETURN NETWORKDAYS(TODAY(), DATE(2022,12,25), 1, _BankHolidays)

But this is my results (noting Scotland is one day out and the tables are correct). It's as if it's only subtracting one holiday.  

Appreciate this can be done via other means, but really want to crack this with this DAX function. 

Any help, greatly appreciated! 

Edit: API endpoint is here, allows anonymous access:

https://www.gov.uk/bank-holidays.json