Having googled the visit it seems that the royal couple arrived in Stockholm on Britannia so presumably P.P. went home on her.
FW - you might be interested - I managed to copy and email the Op Order to the daughter of Surg-Capt Steele-Perkins. She had never seen it before, indeed she was unaware that her Father had been involved. I had a charming e-mail of thanks - so together we brightened someone's day. Many thanks
Glad to pass the info on, any other families reading this?