Snowdonia Zipline Challenge

In July there is a group of us completing a walk up Snowdonia, doing the zipline and also a few of us will be completing the cave challenge as well.  
Anyone who knows me knows I am terrified of heights, so naturally I have agreed to do Snowdonia's zipline over the Quarry. As well as the walk up Snowdonia.
We would like to do this in aid of raising money and awareness for the charity Debra.
DEBRA is a national charity and patient support organisation for people living with the rare, extremely painful, genetic skin blistering condition, Epidermolysis Bullosa (EB) also known as ‘Butterfly Skin’. EB causes the skin to become very fragile and tear or blister at the slightest touch. With your help we can find treatments and cure(s) for EB.