I have an idea to set up a Bitcoin mining. This model of business does not depend on a customer demand only on the computing power of your device. ROI is planned after 12 months and consumption of devices is 3-4 years. In the second year planned earning is 30k and the third year 20 k in year four company need modernise device to prevent further decrease efficiency after next 10k investment we can back to the performance of 40 thousand pounds a year . This is not included the rise of BTC price. Prediction on next 3 year is growing to 2000$ per coin so profitability is much bigger than expected profit in this moment.