Having never run a marathon in my life, I felt it was high time that I decided to walk the equivalent of three of them in one day. 

Both my parents suffer and have suffered from this terrible disease. The minimum I have to raise for this walk is £475, but I want to aim for a lot more than that so please support me kick dementia's ass. Off.

Here's a little breakdown of how your money can help... 

£500 could mean 40 callers getting the expert advice and support they need from our National Dementia Helpine. 

£1,000 could fund a research nurse to be involved in a study at the forefront of clinical science for a week. 

£1,500 could pay for five people affected by dementia to have an hour of one-to-one support a week for a year from an experienced dementia support worker to help them feel less alone and to identify the services that could help them. 

£2,420 could pay for four people with dementia to attend weekly sessions of a Dementia Cafè for a year, where they can meet others living with dementia, share experiences and feel the benefits of supporting each other. 

£3,700 could pay for a group of five people with dementia to enjoy one session of Singing for the Brain® a week for a year. 

£5,000 could pay to train an advisor working on our National Dementia Helpline, so that people affected by dementia get the advice and support they need.

And here's a little breakdown of how my body and mind will break down over the course of the 100km...

1KM. Piece of piss. Probably start laughing at the notion of this being hard or taxing in any shape or form in a minute. Might even get cocky and walk this backwards or something. IPODs are awesome.

3KM Who the hell does this guy on my right think he is? I'm going to race him, in my head. No way he's beating me. Bring it on complete stranger man!

7KM Wow. He's really fit. I can't even make him out now, he's that far ahead. And prepared too. He was in thermals and everything. Knew jeans was a bad call. Wish I'd packed a charger. IPOD dead.

10KM. Alright. I mean I'd obviously rather stop and just pay the full donation amount myself but still...is this all you have for me London to Brighton Trek? Is this your best shot? Man, it is good to be alive and doing something, you know? Helping people. Love it.

30KM. Right. I want out. NOW. I'm walking to Brighton, FROM LONDON! What sick freak dreamt this up? Is this a live, touring version of Saw I'm in here?! No-one is talking to me. They're all just walking, in silence. WHY ARE THEY ALL JUST WALKING? WHY AM I WALKING? THERE IS A TRAIN THAT PASSES ME EVERY FORTY MINUTES, WHY AREN'T I ON THAT? Help me! HEEEEEELP MEEEEE!

50KM It's nightime. I've been walking all day. This is never going to end is it? What are feet? I lost the concept of them somewhere round Horsham.

60KM WHERE ARE WE GOING AND WHY AREN'T WE THERE YET? WHO IS IN CHARGE HERE? i NEED TO SEE A BIB, FAST!

70KM Getting a bit delirious now.

71KM alskvn .smh[0wsa]rrlgRG/....,,;;fw,e[-2--oklsdmvlm

80KM Why is no-one with Alzheimer's doing a walk for me? Am I the only one thinking that? My feet are seventy percent blister.

85KM I'm through the wall. I'm in a zone. I can do this. I can do this!

87KM Haven't cried like that in a long time. Whoa. I do hope that man forgives me. Or was it a cow? I am literally unable to tell the difference between human and cattle now. I'm at THAT stage.

90KM I reckon I could keep going you know? hey guys, when we get there, shall we al just turn around and head back? See how far we get? Guys? Cows? Anyone?

99KM This is awesome. I did it. This one's for you Dad. And Mum. And for everyone out there's Dad and Mum or friend or relative or Cow.

100Km Nobody talk to me for a month.