How will I communicate in the foreign country, will English be sufficient in UK/Australia for a Master's?

Yes, English will be sufficient for communication in the UK and Australia, as it is the primary language used in academics, daily life, and official matters.

In Germany, many master's programs are taught in English and universities in major cities use English widely. However, outside academic settings or in smaller towns, knowing some basic German can be very helpful for daily interactions and official tasks.

If you plan to stay in Germany long-term or seek local job opportunities, learning some German is recommended.