DE
If world is temporarily taking channel (or vice versa) then they don’t have to switch the feed to presentation direct to the other studio, they can take the other studio on an Outside Source. In order to stop any unnecessary duplication of work, they can ‘slave’ the lower thirds and live locators to the other gallery, meaning that the style is maintained but the captions should appear as they are run from the other gallery. This is very useful when there are different programme styles. It would appear here that a Viz engine was picked up before a slave, and not told what the current style for World was. Quite why that viz was still in the old pre-reith style is a slight mystery.