Britain's Queen Elizabeth talks to injured Royal Marine Paul Barrett as he shows her some of the features on his new "Motability" vehicle during a ceremony in Windsor Castle, Windsor April 25 2017.

Seven year old Dina Rayburn presents Britain's Queen Elizabeth with flowers during a ceremony in Windsor Castle, Windsor April 25, 2017.

Britain's Queen Elizabeth talks to recipients of new "Motability" vehicles during a ceremony in Windsor Castle, Windsor April 25, 2017.

Britain's Queen Elizabeth talks to injured Royal Marine Paul Barrett as he shows her some of the features on his new "Motability" vehicle during a ceremony in Windsor Castle, Windsor April 25 2017.

Britain's Queen Elizabeth talks to Edward Todino as she presents him with his new "Motability" vehicle during a ceremony in Windsor Castle, Windsor April 25, 2017.

Britain's Queen Elizabeth talks to recipients of new "Motability" vehicles during a ceremony in Windsor Castle, Windsor April 25, 2017. REUTERS/Richard Pohle/Pool

Britain's Queen Elizabeth talks to Edward Todino as she presents him with his new "Motability" vehicle during a ceremony in Windsor Castle, Windsor April 25, 2017.

Britain's Queen Elizabeth stands next to an old subsidised, low cost mobility scooter from the 1960's, during a ceremony in Windsor Castle, Windsor April 25, 2017.