Kitchens, Catering Facilities, Restaurants and other food producing businesses are under increasing pressure to trap and separate FOG (fats, oils and greases) and dispose of these without emptying them into the water/drains/sewer systems.
Failure to do so can attract heavy fines and in many cases cause blockages. The relevant law:
UK Water Industry Act 1991
The relevant section is S111(1) which states “… no person shall throw or empty any matter likely to injure the sewer or drain, to interfere with the free flow of its contents.”