Out of curiosity etc, I've been doing a few searches for similar issues, and found this, another chap whose CGR Ti cracked around the internal routing holes. Not heard of that particular issue with any other titanium frame brand- including Kinesis, who of course have at least a few reported failures of their own, including on here- and they all offer internal routing as an option if not as standard. A weak point in the Ribble design, perhaps…
Did not Michael Adu's Enigma suffer from the same problem? Thankfully they replaced it.