Would it not be prudent to add something to allow members to get rid of a director or directors who are going against the aims?
This is a very tricky area. I know of a charity were the Chair (both a Director and a Trustee) was removed by sending in the relevant form, duly signed by one or more Trustees (or Directors). This was not spotted by the Charity in question for about nine months. Cheques had been signed, meetings convened, all without knowing that the Chair was not longer in post!
Anyway, I believe is the job of Charities Commission to make sure that Trustees are acting within the confines of the Objects. If somebody (inside or outside the Charity has cause for concern, then there must a mechanism for redress.