When did you last heard from Newton lagoon that they still have places ? I hope is not during yr familiarisation visit in Feb I lot of things can change. A place is only secured when they selected after completing the entrance assessment & you paid the initial deposit. Normally when they are selected, you are given an offer letter & a time frame to pay. In the event that you past the required time frame, they will assume that you are not interested & places will be given to people whom are interested in the school. Since you are not able to contact them, suggest you to send them an email followed by a call to show your sincerity.
What simon said is true, top schools are all full & have long waiting list. Never the least, grab whatever which is available & put them into waiting list for your desired schools. Move them when it comes available. FYI, there is also a newton branch called Newton British School ( NBS ) . You may want to give it a try. I know DBS & DC has already done their entrance exam for coming Sept intake in early Feb.