what colour ties can political presenters wear?

Now I'm puzzling about the television presenters' ties as fallout from the recent election coverage. There's been a general trend towards male presenters having purple ties during election coverage, so that it is neither red (Labour) nor blue (Conservative). Green is its own statement and orange and yellow (Liberal Democrat) are quite difficult to pull off. Only the quirky and high-end presenters seem to get to wear Jackson Pollock splattery-styled ties.

So purple became de rigueur during election coverage, until that extra party appeared and has taken the colour for its own logo and backgrounds.

Yesterday I saw one of the pundits wearing a kind of pink and black and white striped number.

This could all go a bit weird.