In the last week of my employment I discovered that there is a dyslexic font designed by a dyslexic - dyslexie - sadly not free.
They also produce a dyslexic office suite Dyslexia Office:
But there is a similar one, opendyslexic font.
This font can be installed using the terminal - instructions on the page.
Hope this is useful for any dyslexics out there.
Just to add following info from another site I found that dyslexie font was the most preferred followed by opendyslexic font with Comic Sans coming in third place.