In reply to purplemonkeyelephant:
I've got some heavy Pro Shell Arc'teryx salopettes but they weigh about 650-700g so they're way overkill.
It would mainly be for routes AD-D+.
My friend has just come back from the alps and said it was raining/snowing almost every day and he wished he had some waterproof trousers.
I'm going to be wearing ME Ibex.
I'm considering something cheap like the Marmot Precip - I can find them for about £50. I've seen some nice Arc'teryx ones which tick every box, but I'm not shelling out £200 for some overtrousers I'll rarely use.