The effects of laser treatment are permanent, but your eyes may change over time. That's why its recommend having the procedure after major eye changes have occurred in your life.
But otherwise, its long term procedure.
My dad had his Laser eye surgery done from Accuvision 12 years back and even today he can see clearly and has not faced any problem driving or seeing in the dark. Accuvision is a great clinic. It is affordable and their after care is also very good. They offer free consultation. They also have a 10th anniversary offer going on. You can check the details here.
http://accuvision.co.uk/offer/