Before you let VB or anyone else touch your frame, ask to see detailed photos of disc mounts they have previously added to Ti frames.
I'll say no more.
[edit] OK, I WILL say some more: I've seen some disgraceful things done to Ti frames by so-called UK "frame builders"... specifically aftermarket disc mounts. We are NOT talking Moots type quality here - rather the splatter gun approach.
If your frame is even halfway decent, you might be [COUGH] "disappointed" with the end result. [/end iedit]
Maybe call Paul Hewitt Cycles to see if they can advise.