Not sure if this is a good deal, but seems cheap for a 4TB drive to me. What makes it even more enticing is that the 5TB is only £1.01 more expensive although not in stock, but if ordered from Amazon and stock becomes available they would have to honour the price.
Some details from Amazon -
Handy portable storage
Durable black design
SafetyKey TM protection for your data
SuperSpeed USB 3.0 (Max): 5.0Gb/s