This would not be a charitable trust - you can use the following structure [to be considered charitable, each of the dispositions]:
(1) must promote a charitable purpose (The Charities Act 2011, s. 2(1)(a))
(2) which satisfies the public benefit requirement (s. 2(1)(b); for the definition of public benefit requirement, see s. 4)
(3) and that purpose must be exclusively charitable (s. 1(1)(a)).
There must be no personal nexus between the settlor and the beneficiaries - look at Re Compton, and more modernly, Oppenheim v Tobacco Securities. If there is, the trust is not considered as for a charitable purpose.
Do you need to consider if it's a valid disposition anyway or just whether it is valid in terms of a charitable trust? Does the question say anything else? It's a bit vague.