It is of course not a total ban, but pretty darn close.
Create narrow and carefully defined exemptions to the ban for:
Items with only a small amount of ivory. Such items must be comprised of less than 10% ivory by volume and have been made prior to 1947
Musical instruments. These must have an ivory content of less than 20% and have been made prior to 1975
Portrait miniatures. A specific exemption for portrait miniatures – which were often painted on thin slivers of ivory – made before 1918
Sales to and between accredited museums. This applies museums accredited by Arts Council England, the Welsh Government, The Scottish Government or the Northern Ireland Museums Council in the UK, or, for museums outside the UK, The International Council of Museums
The rarest and most important items of their type. Items of outstanding artistic, cultural or historic significance, and made prior to 1918. Such items will be subject to the advice of specialists at institutions such as the UK’s most prestigious museums