Hello, I am Keith, one iof the experts on Just Answer, and pleased to be able to help you with your question.
Your accountant is correct as far as business accounting is concerned. You have sold an item of business plant and machinery and irrespective of whether it was bought with VAT or not the sale is subject to VAT and you will have to top slice your selling price to account for this.
However, if the purchase and sale was an entirely private transaction outwith your business then VAT will not apply at all.
I am so sorry to have to rain of your parade.
Thank you for your support.