In reply to jbpilon:
There are lots to choose from. I was in the Atlas ice climbing with Matt Stygall in December and also December 2018. He's a great guide and friendly too. He has his own website as most do. He is based in North Wales.
Graham Frost also. He is based in Arolla. He offers Monte Rosa trips too. Another guide I have been with before.
Have a great trip whoever you choose.