If you have let one of your licences or ratings lapse, depending on how long it has been it will need some re-training and then a test. If it has not been too long then it will just need a renewal. This is much simpler, and usually just involves a test.
We have the instructors and examiners available to renew or revalidate almost any light aircraft, and we can also conduct the bi-annual flight test with an instructor on any aircraft including your own.
However much experience you have it is always good to fly with an instructor who can weed out bad habits and improve your flying and make you a better pilot.
Click on this link to look at some flying tips which are from the old site.
Pictured below is one engine shut down, or in idle, and the propellor feathered in a King Air 350. Not many people get to fly one of those, but it is the sort of thing that all Commercial Pilots have to practice no matter what type of aircraft they fly every six months.

King Air 350 with propellor feathered