"I see the trash rag is now claiming Roslyn wrote that Markle Snr travelled for the "12 year olds", which is clearly appalling if true, but how the hell is the Scum accessing these alleged letters anyway? It's hardly usual for material likely to be needed for a prosecution to be shared with slavering hacks, so what exactly is going on here??"
I don't think the letter Roslyn sent to the Met could be used in any kind of prosecution anyway, which is why its claims were never investigated. It's all hearsay, he said/she said, with no specific allegations and perhaps without indicating any actual crimes. What Roslyn wrote was that Thomas Snr told her he travelled to the Philippines and Thailand because 12 year olds are legal there. She didn't, however, write that did anything with 12 year olds. From the tiny bit of context we have it sounds like they were arguing or something (she had confronted him with some other allegation that he denied and then apparently he said that to her).
In some interview I saw somewhere, Thomas Jr said that he heard that in the 1980s his father - while married to Doria - would travel to Thailand for young women. If this is what Thomas heard, then he may have heard it from his mother, which suggests that the conversation between Roslyn and Markle Sr that Roslyn writes about may have happened many years after their divorce, when she was unlikely to be well-disposed to him.
If Roslyn had real evidence of criminal activity by Thomas Markle then she should have contacted the FBI or American law enforcement, not the Met.