10 British Idioms in 10 Minutes

Do you know the meaning of these idioms? Try to guess what they mean and watch the video to check if you were right.
-Not my cup of tea
-A piece of cake
-Go pear-shaped
-For/In donkey's years
-Across the pond/Down under
-Cheap as chips
-Pardon my French
-Do a runner
-Itchy feet
-Can't do something to save your life