Zoe has very kindly gotten in touch, and the flowers in memory of Chris will be sent care of his sister. I have the address now.
His brother's girlfriend is called Rachel, and Zoe is getting further details about where in the hospital she is. Once I have this information, I will ring them to check they receive flowers. If not, Zoe has said it would be ok to send them care of Chris' sister as well.
Zoe is also finding out from his family details of a charity, but she mentioned that understandably it is difficult to get hold of his family at this time.
More tonight...
I think I remember reading that she was in Wexham park. I can tell you (from 1st hand experience with Wexham Park) that flowers are not guaranteed to be delivered to the patient. I would advise against this as your kind actions may go un-noticed. Sad but true.