Mitre saws are perfect for making angled cuts. It weighs in at 9.5 kg, so it should work for everyday use and weighs 9.5 kg, so it's not that heavy to carry around.
Wilko
Draper D20 20V Brushless Sliding Compound Mitre Saw with Batteries and Charger 185mm - Blue
The Range
Draper D20 20V Brushless 185mm Sliding Compound Mitre Saw Kit - Blue
Electrical World
Draper D20 20V Brushless Sliding Compound Mitre Saw (185mm)