Now I've found that Newton also voted AGAINST, see the bottom of the first column on page 4 of this report. Their explanation for the decision is worth repeating:
"Newton felt that the company's shareholders should not be funding such a cause and that it should a matter for individuals to decide on the personal level of support that they want to provide to political parties."
Exactly. If individual directors of Caledonia - or Fidelity - want to give the Tories their hard-earned then that is up to them. But they should not use the company's money to provide partisan financial support.
The updated list of voting decisions so far -
Baillie Gifford - AGAINST
Co-operative Insurance - AGAINST
F&C - AGAINST
Insight Investment - FOR
M&G - ABSTAIN
Newton - AGAINST