TOM ARNOLD LIBYA's sovereign wealth fund head plans to ask the United Nations to allow it to invest billions of dollars sitting idle in its accounts, after missing out on some $4.1 billion in potential equity returns during nearly a decade of sanctions. The Libyan Investment Authority (LIA) was blacklisted in March 2011 because it was then controlled by the family of toppled ruler Muammar Gaddafi. Its assets were valued at $67 billion in 2012, but LIA plans to update that in October after a review by its financial adviser Deloitte. Sanctions have had a heavy toll on the LIA,…