Bathroom Sink Backs Up Into the Tub?
improper plumbing inside the wall
Growing Lily of the Valley?
Let the tops die back and then cut off. Take up every two years or so and transplant the babies.
Equivalent of Dawn Dish Soap in the UK?
Can you get Fairy at the store? Use it straight out of bottle.
Growing Lily of the Valley?
Throw the excess roots out or put them in a compost pile.