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Easy way for @johnnettles2 to tell would be to use a magnet. Ti is magnetic but only ever so slightly. There will be a marked difference between it and the steel tubes.
Isnt there more then one Titanium builder in UK? Also, I kind of think that normal tool would do it, as you said u r just chasing the thread and not cutting it and hardened steel tools should be harder then titanium (random google of hrc scales).. good luck