I used to work for the amazing Maggies Cancer Caring Centres. They have a centre at Charing Cross Hospital, on the Fulham Palace Road and offer masses of support for those with, or caring for, living with, or relatives of those living with Cancer. The Centre is staffed by Cancer Support Specialists and they offer individual advice and support as well as many group sessions. I know I am biased as I used to work there but I cannot tell you how amazing the centre is. Please do pop by, or visit their website for more information. I really hope they will be able to help you.
http://www.maggiescentres.org