Importing a high value car from the UK in Spain post Brexit, now comes with added costs. As the UK is no longer in the EU and the standard process to import and register a UK car in Spain now involves customs.
This means on top of the registration tax which in most cases will be 17% of the vehicle value, 10% customs duty and 21% VAT will apply, unless you can find away around it.
Paying nearly £50k to register a £100k motor is simply not a consideration. There are however various ways these huge costs can be avoided, bringing the cost of importing and registering high value cars in Spain down to a few thousand Euros, rather than tens of thousands.