If you have not renewed or revalidated it in the past 7 years you will have to retake all of the exams and undergo considerable training to get it back
What is happening to UK airline pilots who have been working in say USA or HK and who want to come back?
Is there no route for them, or is giving up flying their only option?
Virtually nobody is actually going to do the 7 exams and the 55hrs training...