Hi flowerpower and welcome to Orchid Board
You won't kill your Phal by cutting the spike. Personally I would cut the spikes off completely but some people like to leave them. They
may flower again from the same spikes but not always.
Where did you buy it from? I've seen ones in pots like that arround here (I'm in the Midlands). I can't remember from when I saw them, is there an inner pot or is it planted directly in the white pot? If there is no inner pot I would strongly advise repotting in a clear plastic post with holes in the bottom.
Anyway, your question about light. I will make the assumption that most places in the UK will get similar light to me. I keep my Phals in an east window which is generally about right. Phals don't like it too bright, they generally like indirect but quite bright light. I find that the morning light is fine for them but a south/west window would be too much.
If you move yours for more light, move it a bit at a time, getting brighter and brighter. If you move it suddenly it may scorch.
As for getting more flowers... well a lot of Phals (although not all) will start new spikes over the winter when the temps drop. My hubby and I only heat the house in the daytime over the winter and the cooler temps at night are enough to trigger new flower spikes.