We have 4 x Goldshell - CK5 - CKB Miners (12 TH/S) located near Portsmouth. These were purchased brand new from Coin Mining Central U.K. 2 are 2 months old and two around one month old. No issues whatsoever. Happy to send videos of them running and can provide receipts from Coin Mining Central. Selling due to office relocation and lack of space thereafter. We are based in Fareham. Full address can be provided when making the deal.