How much Gate's or Soros' time costs in pounds? I bet this way you could also calculate it in thousands. Or explicit support of the very US President? How much is that in money? If you count it thst way yiy can easily get gigantic numbers.
Doesn't matter. Expressing support doesn't count as payment in kind under UK election law. Just as well really, otherwise anyone who spoke in favour of a campaign would need to declare it.