You can use the NHS Online: 111 app outside of London if your home postcode or the postcode of your registered GP in in the pilot area. Please check to see if they are here.
However, you will need a good internet connection, and the outcome of your interaction with the app may be that you require a call back from an NHS staff member. Neither babylon nor the NHS will be responsible for any call or internet charges you incur. You are also responsible for ensuring that any medical care or advice you receive complies with the laws of the country that you are in.