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I got some Ti bolts & nuts but the haven't noticed any bad corrosion on those I didn't replace. I'd be tempted to say it's not worth it. I have had more trouble with the brake callipers when it comes to both cosmetic and functional corrosion. Had to rebuild the front after it seized last year but preventative GT85 as a polish and greasing the spring where it slots into the back of the pivot seem to be the key - do it before the salt gets in there especially if you are riding country lanes with extra salt!
Also re. grips I put Ergons on my first Brompton buy not the last two and have got used to it, don't panic!
Glad you're enjoying it so far, hopefully will bump into you at TH fairly soon again to compare helicopter taped bits.
Is there any benefit besides marginal weight and bling improvements to getting the ti rear pivot hinge axle and bolts? Did I read something about the steel one rusting up?