i assume your in the UK been as you changed to £ so lets say a bitcoin is worth £120 (to play it safe)
you get around 0.03btc per round
BTCmine finds a new block every 2 days (playing it safe) sometimes longer but most times shorter
so each month youll get about 0.45 BTC which would be about £54
so youll be breaking even if the price of BTC goes
i mine on the pool to
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
i like it and i make huge profit out of it but i am using a 6870 and 2 5870s pay for the electric 3 or 4 times over at the moment