Consider the validity of the following dispositions:

a)I leave 10,000 to my old friend Mohammed safe in the knowledge that he will respect my wishes and not take it for himself. Instead, he shall distribute the income amongst my relatives in such amounts if any as he sees fit. He may accumulate any income that is not disposed of. He shall distribute the capital and any accumulated income amongst whichever of my children as he shall think fit.

b)I leave my collection of 15 classic cars to my trustees, Avram and Arsene. They shall in their discretion distribute the cars amongst any of my friends or former colleagues so that any friend or former colleague of mine who wishes to claim one of the cars within ten years may be given the opportunity to do so.

c)I leave my holiday home in London to be sold confident that Mathew will share the proceeds with his three children.

d)The bulk of the remainder of my estate to be given to Mary.

Support your discussion with reference to relevant sources of law.