I live in Britain and I pray in a mosque that is near where I live, but the congregation in this mosque puts Maghrib and ‘Isha’ prayers together at the time of Maghrib. The reason they give for that is that the time period between ‘Isha’ and Fajr prayer is very short and is not sufficient for rest. Please note that the imam of the mosque gives as evidence for that the fact that according to the report of Ibn ‘Abbaas, the Prophet (blessing and peace of Allah be upon him) put together Zuhr and ‘Asr, and Maghrib and ‘Isha’, in Madinah with no excuse.