.uk domains require a "TAG" to transfer
To transfer a .uk domain name to Hostica, please use the following TAG instead of an EPP code for the authorization process.
To transfer a ".uk" domain AWAY from Hostica, use for the "TAG"
* if registered with us thru Tucows - the tag is TUCOWS-CA
* if registered with us thru Public Domain Registry - the tag is PDR-IN
--- UPDATE 2019-07-15
Nominet has changed the requirements for .co.uk
To only require owner contact information.