Calendar (other) Missing/Incorrect UK Holidays dates

Has anyone noticed that there are both missing (Guy Fawkes, Halloween for example) and incorrect (i.e. Boxing Day (observed) for 25th Dec 2015) being seen on the native UK Holidays within the Calendar app for iOS?

Interestingly, I have subscribed to Apples UK Holidays .ics on iCloud which is showing the correct and missing dates.

I've simply un-ticked the OTHER UK Holidays cal, and ticked the subscribed iCloud version, which although works, is a little annoying.

Any other solutions you can think of?

Thanks.

Lee