Now i see great potential in a business which involves those ATM Cash Points
The price for those machines will play an extremely large role in whether they will be an attractive business for you. If they cost £1000, for instance, and you earn £1.75 per transaction, it will take 571 transactions just to break even.
I don't know how often cash points are utilized, but I imagine you could determine this with a little legwork. Park yourself for several hours with a pint at a local pub ATM that gets a fair amount of business. Count the number of transactions that are done each hour. Do this at several different locations over a number of different time periods (happy hour, lunch hour, middle of the afternoon, early morning, etc) to get a feel for how many transactions a cash point could realistically do in a day. This will let you help you estimate how quickly you could expect to generate a profit.
I wouldn't be surprised to find that there are hidden fees that you'll need to take into consideration. For instance, a pub or a convenience store will probably want a fee or even a percentage of each transaction fee for the right to place your ATM in their establishment. There might be monthly bills for the electricity usage of the machine. Merchant services like VISA or Mastercard likely charge for access to their network of banks.
Then there's the maintenance and upkeep. How long do these machines last before they need to be replaced? How often do they need to be serviced and how much does this usually cost? Someone will need to regularly replenish the supply of cash.
These are all questions I'd recommend you thoroughly research before making a big upfront investment. That way you'll set your expectations appropriately as far as the profitability of this business is concerned.