soooo if (according to the 18 degrees calc) in the british summer isha does not have a start or end time... so technically we could read magrib, isha and fajr in the last third of the night together? at that time there would still be light in the sky and magrib would have started and fajr wouldn't have ended, so reading all 3 namazes together in fajr time would be technically ok right? this is an interesting question to know bcos say you had fallen asleep after asr namaz and woken up in the middle of the night. then instead of doing qadha namaz of magrib and isha u could read them as adha and also fajr. so u would get all 3 namazes without any being qadha.