In reply to balongworth:
Matey, it's a long "mountain" route- I'm assuming you're looking at
http://www.ukclimbing.com/logbook/c.php?i=5739
There's no particular gear that is useful beyond what most people consider requisite for multipitch routes. Have you ever done a multipitch route?
It's not really any different to a single pitch route, except you will need sufficient gear to build TWO belays. So a big part of it is quantity. If you've got a set of 10 nuts, placed 6 runners, that's only 4 left- and you'll have to be lucky to find they're the right size for a belays.
There's always going to be a bit of being lucky, and a bit of being unlucky, but I guess most people would look at having:
*Two sets of nuts
*some cams/ hexes
*a good selection of LONGER extenders (those 10cm sewn ones a lot of people seem to carry these days don't really cut the mustard on this sort of route)
*a few slings with a caribiner for each (for building belays or using over spikes/ threads/ extending runners that are way off line)
*2 or 3 screwgates each (on top of the one for the belay plate)
Cordlettes can be great, if you're used to using them, for building quick belays.
I hope you're also pretty switched on at belay building generally? You understand equalising, direction of pull (including upwards), the need to protect the belay (i.e. fall factors).
Can I also ask you- do you feel confident in your climbing 'procedure'? This can be important on long routes like Milestone Buttress, where there's every chance you won't be able to communicate with your partner at stances- and that means both of you have to be confident about what you're doing.
I'm assuming you're all helmeted up too?
-A
ps- if you don't really groove on any of the above, then I'm sure you'll still go out and have a great day- it's just you did specify 'safely'.