Help to find my Dads service number and possibly people who served with him

Hello
I hope I am posting this to the right place.
I am trying find out my Dads service number in order to request his service records, I was wondering if anyone on here could help me, also I am hoping to speak to anyone who served with him. My dad's name is David George Jones, he has been called George for as long as I have known. He was from Machynlleth, he was in the 1st battalion infantry brigade of the RWF and was in Hong Kong in 1969 and I believe he was also at the investiture before that. That's all I really know, I have an article but I am not sure how to upload it yet, I am new to this forum.
Thank you for taking the time to read.

Kate,

Hello and welcome to the forum!

If you send me the article you have, I’d be happy to upload it for you.

email: bob6995@me.com

Awesome, I'll send it to you now, thank you ☺️

Here is the newspaper article Katie alluded to in her initial post