Series 10 Casting Discussion

[Naivety]

I hope I'm posting this in the right place as although I'm commenting on a casting decision, it's definitely speculation!

I was just looking at the pictures of Geoffrey Streatfield, who has been announced as joining the cast, and wondered if he was going to play a younger Harry Pearce. Judging by filming locations being spotted, the series seems to be going back to Harry's past.