IVA started March 2011, Completed March 2016 and certificate issued 11 days after final payment. It was not always easy but then some of the best decisions aren't.
If this is for a mortgage there should be no need as the Council of Mortgage Lenders have agreed to accept the tax calculation and summary page. If this is not enough HMRC will send them out by post of even fax them but I do not think as yet they can be emailed.