.....next to diddly-squat, I am afraid.
The WAY foundation wasn't much use for me, as all its events were evening meets it was impossible for me to attend as I was without urchin care. Others have, I know, found it very supportive, though....
Winston's Wish is often mentioned. They do have a website which is well maintained and may aid some children. They also have a phone service, which I phoned twice. The advice given was unhurried and sound.
However, they are a regional charity (Gloucestershire) and not funded for national work. They could only have intervened with the urchins had I, or the PCT paid (some thousands, I asked). The PCT would not pay as there is a more local service, which at the time was full and not accepting admissions...
CRUSE is ok for adults, but I think definitely not for children.
Your friend may have more luck than me, especially if a hospice was involved. These tend to have specific bereavement services in place, often employing people with specific child counselling skills.
(Mrs Goth keeled over and snuffed it due to cardiomyopathy, so not relevant to us)
.....this site was of great aid to me. I no longer use it (you poor buggers on this site have the dubious pleasure of my company instead) but the folks there aided me greatly, both online and in person. There is an associated Google group with a chatroom, too. It won't appear on a search engine but if your friend were to post on the site I linked to, he would be helped to find it.
...hope this is of aid.