Ok, front shifter is compatible, it's 105. On the cassette, I'm running a 105 11-25 10 speed. Front and rear mech is 105 too, bottom bracket is Shimano FC-5600. The frame should be ok, because the bike I've got was available in a triple option too.
I like my compact, but because I'll be carrying panniers and tent etc, some easier gears for the hills would perhaps make more sense.
Would it be worth changing the chainset but leaving the existing cassette, or would it be in my interest to go for something like a 12-27? All in all I'm considering 50.39.30 with 12-27 cassette - up from a 11-25