HMRC have updated their tax, interest and penalty calculator for the tax years ending 5 April 2006 to 5 April 2024 and 5 April 2010 to 5 April 2024.
Please see:
Calculate tax, interest and penalties for the tax years ending 5 April 2010 to 5 April 2024 – GOV.UK
Calculate interest and penalties for tax years ending 5 April 2006 to 5 April 2024 – GOV.UK