Themes and population groups do not match up with regulated services – there may be a number of different markets within individual themes, and some that cross over themes.
Nid yw themâu a grwpiau poblogaeth yn cyd-fynd â gwasanaethau a reoleiddir – mae’n bosibl bod nifer o wahanol farchnadoedd o fewn themâu unigol, a rhai sy’n croesi themâu.