On April 26th, 2018, UK ratified the UPC agreement as the 16th country to ratify.
In order for this agreement to enter into force, now only Germany still has to ratify.
This notification is currently on hold due to a constitutional complaint, which is to be handled this year. If this complaint is dismissed by the summer, it would be possible from the beginning of 2019 to validate European patents as a unitary patent.