Now, considering that England has government run healthcare, and IVF is paid for by the government... who do you think benefits from extra embryos? Here's a hint... its medical research.
If anything, the disturbing trend to use frozen embryos should scare all of us with government healthcare on the horizon in the US. If they are paying for IVF, you can bet some way, some how, the government will take as many embryos as they want to use for research. THAT should scare you a helluva lot more than families wanting to have children.