Sorry for your loss.
When you say you want "the government and the nhs" to fund "more research and genetic testing" do you have a proposal on how this would be carried out?
I work in cancer research and we are generally funded by charities like the mrc, cruk, etc, or by big pharma companies. Not the nhs or government.
Do you know what research and testing you want done? Are there any adult programmes you could piggy back on?
Biochemically speaking, a tumour is a tumour, and there's not much difference between adults and children. Where the differences do kick in treatments- only it's very difficult to get testing of such toxic treatments done in children.
Not having a go or dissing your petition, I just think it's very vague, and if you had an actual plan for any money designated to childhood cancer you may have a greater chance of securing funding...