Yep, it's on the metal plate when you open one of the front doors, can't remeber which side! It'll be a metal plate and on the right hand side of that plate, second line down, you'll see a code. Alabaster silver will probably be NH700M, but double check.
As far as touch-up kits go, I've heard mixed things about Halfords kits, mostly negative. I went with a Chipex kit and overall I'm pleased with it. Can't say it's a 100% percent match on my metallic grey (not sure any kit is though), but it's good enough for me. I'm going to be touching up some larger bits on the rear bumper soon, so that'll be the biggest test for it. The Honda kit does indeed come in two parts like the Toyota one you had, but the Chipex is premixed and you basically just need to apply.