I've raised £2500 to help my friend Richard and his lovely family fund his lifesaving cancer treatment

My friend Richard's story is one that has touched me and my family deeply. Richard and his family - Holly, Evie (10) and Mabel (5) - were only just starting to celebrate completion of Mabel's sucessful but punishing treatment for Leukaemia when Richard was suddernly faced with a diagnosis of an aggressive brain tumour. Just unbelievable. Thankfully, Richard and Holly's pragmatic and forward thinking attitude is something to behold - and there is a cutting-edge, but expensive, treatment available which represents their best chance to beat the cancer and save Richard's life. Richard's full story is here: https://www.justgiving.com/crowdfunding/daddys-brain-bug
I have three children and my youngest (Aurelia) is close pals with Mabel - we saw some of what Richard and his family were going through during Mabel's treatment and I can barely imagine what they are going through now, and am in awe of their awesome attitude. So what can I do to help them? Well I used to do a bit of running - or at least I was able to run(!) - so I can train for and run a long way, a half marathon to be precise - a challenge, yes, but a microcosm of the challenge Richard and his family are facing. So please please give generously and help me help them!