On 23 April 75 runners will be taking on London Marathon to support RNIB. One of those taking part is our very own Dave Williams, host of ‘Tech Talk’. As a blind runner himself, Dave runs with the support of a fully sighted guide. But how do you become a guide runner? And what does guide running feel like? Dave talks now with Rob Douney, who will be guiding him at this year's London Marathon.

Follow Dave's fundraising journey here - Dave Williams is fundraising for RNIB - Royal National Institute of Blind People (justgiving.com)