By laws can be made by local authorites eg. Barrow council
they can also be made by large companies eg. British airways
they are made under the authority of the parent act and must be aproved by relevant government ministers.
the local government act allows loacal authorites to make a variety of by laws
they can be enforces in court
local councils have knowldge of local areas and their problems eg. no drinking in barrow park
other examples: feeding birds in public areas, skateboarding…