Fadi Al-Dairi, operations director at Hand in Hand for Syria, told ITV News it is "a big problem for us to get aid inside" the war-torn country.
He said: "We need to be able to enter aid more quickly. Everyone was quick enough to say 'let's go with the bombing' and if instead of going for bombing in Syria, why don't you give us some of the money you were going to spend on the war and then we could deliver aid inside."
More top news
The former royal marine could be released in as little as two weeks after his sentence was reduced from murder to manslaughter.
The painting of the late singer was auctioned to help raise funds for HIV and Aids prevention and awareness.
Katie Hopkins has accused JK Rowling of living in a "fantasy land" as the two clashed in the aftermath of the Westminster terror attack.