VQOTW: DEREGISTERING WHERE THE TRADING PREMISES HAS BEEN OPTED UNNECESSARILY

My client is a small independent retailer selling mobile phones and accessories, with turnover below the VAT registration threshold. Last year, in September 2018, they bought the premises they were occupying from their landlord. The landlord had opted to tax and the purchase price was £100,000 plus VAT. In order to recover the VAT, the client VAT registered and notified their own option to tax. The client’s turnover has remained below the threshold, and they have asked me whether they can deregister, and what the consequences of that would be.