CTM94020 - CTSA: Penalties for late returns: Other types of penalty
FA98/SCH18/PARA2 covers the obligation of a company to notify changeabillity to corporation tax.
FA98/SCH18/PARA17 & 18 covers the potential penalties for failure to comply with requirements by a company to deliver a company tax return.
Please see the Enquiry Manual for more information on both the above subjects.
If a company incurs more than one tax-related penalty for the same accounting period, then you only impose the greater or greatest on each slice of relevant tax - see CTM94240 for more detail.