Okay, working with what everyone has said I turned off Libre's alarms and bluetooth. I then installed Shuggah and set it up in the normal way. Shuggah is working perfectly and transmitting to my watch and Libre will scan manually and give readings, it will also download my Novopen doses. Crunch may come at the next sensor change in eleven day's time. I think that the answer is to have only one app blue tooth connected at any one time. Sooooooo I will disconnect Shuggah and turn off its blue tooth connection. I will then turn on Libre's bluetooth connection but not the alarms, fit the new sensor and start it with Libre. I will wait the required hour and when Libre says that it the sensor is active I will turn off Libre's bluetooth and turn on Shuggah's and connect the sensor to Shuggah. It may prove difficult to do all of this with my fingers crossed. I will report again after the next sensor change. Can anyone see a problem with my idea?