At places I've worked in the UK it is asymmetrical. The employer has to give three months' notice but the employee only has to give one month's. It is intended as an employee benefit, and it is. I've never been asked for more than one month's notice from my side.

I don't know where the OP is located but he should double-check his contract. The first time I heard of the three month period I was reluctant, until I realised it didn't apply to me.