Generally speaking a manufacturer's warranty begins from the date that the vehicle is first registered, but this is something you can clarify with the dealership or Honda UK if it is not shown on the vehicle paperwork. We would not expect a vehicle to be serviced while it is unregistered as it is likely to be kept in storage with pre-delivery protective coverings, and while there is a significant gap between the date of manufacturer and of first registration, the car's age is effectively taken from its date of first registration. There is always a gap of at least several months between the date of manufacturer and registration, but this gap can be affected by several factors. While it was built in October 2023 it may not have reached the UK until 2024, and it is possible that it was a cancelled order which meant it remained unregistered.