An actress who is terrified of heights is joining her three older brothers on a 160ft bungee jump for charity.

Meryl Keeble's mother, Janet, from Starston, was diagnosed with motor neurone disease in 2011 and so Meryl, 30, Daryl, 38, Joel, 35, and Ross, 33, have decided to take a leap in aid of the MND Association.

The jump, which will take place at Grafham Water Park, near Huntingdon, on Sunday, September 23, has already raised more than �2,200.

Meryl, who has appeared in TV series Kingdom, said: 'I'm petrified. I did a skydive for Breast Cancer Care in November 2010 after mum was diagnosed with it, but I'm still terrified of heights.

'When you do a skydive all you really see at first is clouds, and you're strapped to an instructor. But with a bungee jump you're looking at the ground, and you have to jump on your own. It goes against every instinct in your body.

'I try not to think about it, but it's for a good cause – and it's not just about raising money but also about raising awareness.

'You don't think it's going to happen to you, or someone close to you, but when it does it really brings home to you what a challenge it is living with motor neurone disease, seeing what mum and dad have to go through each day just to do the smallest of tasks that we take for granted.'

Daryl and Joel, who live in Alburgh and Wortwell respectively, have been running the family business, Harleston Tyre Services on the industrial estate, since their father, Keith, retired to become his wife's full-time carer.

Ross, who lives in Yorkshire, is the the only one of the four who has done a bungee jump before – off the big dam in Switzerland which once featured in a James Bond movie.

MND is a progressive disease that attacks the motor neurones, or nerves, in the brain and spinal cord. This means messages gradually stop reaching muscles, which leads to weakness and wasting, causing progressive paralysis and eventual death. MND can affect how people walk, talk, eat, drink and breathe.

Meryl added: 'There is currently no cure. However, through doing this bungee jump, we hope to help find a cure for this horrific disease and also support those people and families who are affected by it.'

To make a donation, visit www.justgiving.com/thekeeblebungeejump, call 01379 852868 or drop in to Harleston Tyre Services.