Socci, most children spend a year in Reception, so in your dd's case, it would be September 2006 in Reception, moving to Yr 1 in September 2007. However, if you want to delay her until January 2007, she would still go into reception, but only do 2 terms.
Have you spoken to the school about this? Is there a place for her in the January? If it is an oversubscribed school, they may prefer to fill all their places in the September which would leave you without a place for your dd in January. I would suggest you speak to the school about your plans a.s.a.p.
It may be possible for your dd to do half days for the September term and then go full time in January. It really depends on the school and your conversations with them.
Hope this helps explain it a bit.