Investment Builder is the defined contribution section of OSPS run mainly by Legal and General.
You can pay AVCs as a regular amount or as a lump sum or both.
At retirement you can either combine your Investment Builder funds with your DB section benefits to purchase additional benefits or claim them separately.
Your Investment Builder funds can be transferred out separately to your main scheme benefits if you wish. You can do this even if you are an active member.
Please contact the Pensions Office if you want more information.