Tom seegal

Hello all,please help me ?Right now I am in UK for business purpose but I applied Canada online business visit visa from here in UK 10 days ago .I am a residence of Nepal.but today I got a news from my country that my dad he is passed away today and I need to go to Nepal as soon as possible.My question is can I travel to nepal for few weeks and come back to UK to submit my passport once they approved my visa (Canada immigration in Uk).or can I go to canada high commission, london to tell them about my situation?please please help me ...