The registrar change process for example.uk domains will be the same as the existing registrar change process for .co.uk domains.

The domain transfer process for example.uk domains will be the same as the existing domain transfer process for .co.uk domains.

Holders of third-level .uk domains that are eligible for the free reservation period don’t need to pre-register the .uk equivalent. The shorter address will be automatically reserved for them for five years. Our marketing and customer outreach will continue to make it clear that registrants should not feel obliged to make a snap decision. Registrars...

The five fields that have to match exactly are: registrant name, street1 address, postcode, country code and administrative email address.

See an overview of the domain registration process here.