The new Puffin edition will be published on 2 July, and their edition of The Country Child will be published this time next year.
Here it is available for pre-order on Amazon. http://www.amazon.co.uk/Traveller-Time-Puffin-Book/dp/0141361115/ref=tmm_pap_title_0?ie=UTF8&qid=1435138759&sr=8-1