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One of those little diamond sharpeners should do a good enough job.
something like this
http://shop.jmart.co.uk/3pc-professional-diamond-stone-sharpening-set.html
I've got a little titanium knife which is extremely useful - ideal for stripping off packaging, cutting electrical tape when taping handlebars, opening envelopes neatly etc etc.
It was razor sharp when it arrived, but it now very much needs it's edge restoring - same techniques as for a steel blade, or does the different metal require a different approach?