Thanks to you all for your replies.
In particular Stebie9173. Yes you did make an extensive reply to Michael who passed it on to me. That reply forms the core of information I have on Fred. Since then the only thing I have been able to add is, as I said here in my original post, that having visited Raunds a year ago to take a look at the three addresses the Gates family had lived at I was astonished to see, at the junction of Hill St. and Gladstone St. another street sign for Laswon St. This is clearly where the new name came from but I am still no closer to finding why the name was changed.