Thank you both for responding -- it eased me over the weekend
I did call the council where we plan to live and they told me in September and October there will be spaces that open up and I should apply to as many places as possible. Apparently some nurseries hold a couple spots and she said that some families will have a spot at a nursery, but if they find a better one, their spot becomes available when they don't turn up.
My son attended a day nursery from 7 months to nearly 2 years old when we lived in London before, but it was a private nursery. Now that he's 3, I have more options, which is nice.
I liked the nursery system in the UK. I did not realise, however, that the programs were the same across the board (not counting some private or faith based ones, perhaps?). It seemed more play/creativity based and the 3 to 5's were together -- they seemed to learn from each other.
Thanks for the letting me know about mumsnet to explore other options. I used this site when I was expecting and right after having my son. It was a great source!