Per month, but this is really up to your usage. Some of this is controllable by you (shutting lights off, turning things off standby, turning down the heat, air drying clothes outside when it's nice out), but if you're renting a drafty, single glazed, high ceilinged flat with little or no insulation, you will pay more for heat when it gets cold.
Things like phone, digital tv and internet can be relatively cheap (cheaper than what I was paying in the States). For instance, to have a pretty extensive package from Virgin, you could pay around £50 for phone, cable broadband, and almost all channels (except for things like Sky Movies). There's also Freeview and Freeview plus (Freeview with a DVR) which (as the name suggests) is free after you pay for the box. With that, you could probably bring your phone and internet down to £30-35 pcm.
The other thing I forgot about is contents insurance which you might need to get as a part of your lease (sometimes, not always). It's not expensive though. You're looking at under £20 a month, and likely closer to £10.
IMO, you could easily swing it if your rent is that level and you are relatively careful with your energy use, nights out, groceries, and your commute doesn't cost too much. I am not familiar with the rents around where you plan to move, but those sites I gave should give you an idea if you're not sure.