Excellent news! The IP should have sent a copy to the credit agencies so that it will be removed after the six years.
They will also have sent details to the Insolvency Register who will remove you within three months so you don't need to contact them - just keep an eye on the site.
Sharing from experiences of dealing with debt
The greatness of a man is not in how much wealth he acquires, but in his integrity and his ability to affect those around him positively.
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The IP will have informed the Insolvency Service and the IVA will be removed within three months.
The Insolvency Service, in turn, report to the credit agencies who will mark the IVA as completed.
In September the IVA will drop off your credit files, along with correctly dated defaults.
You can ask for default dates to be corrected if they are wrong.
You don't need to write to Court or the Register - your IP will have sent the CC to the register to have it removed. It takes up to 3 months and you can check here: