For the whole Holiday Extras group of companies

Why do some car parks / hotels say can't amend, can't cancel?

These types of packages are usually slightly cheaper but can't be changed or cancelled*.
Packages with extra flexibility cost slightly more but give you the option to amend or cancel the arrangements 24 hours before your package start date.
These packages may also be known as being 'non-flexible', 'flexible' or SuperSaver.
*personal details, including car registration and flight numbers can be changed free of charge.