What rights do I have? Police enquiry?

I live in a very quiet town in SW England. The road and the estate we are on is very quiet and there are a lot fo children here. There is a house opposite us that has now had three visits from the Police - I am talking armoured van and body jackets etc. The third "raid" was today. I was at work (5 minute drive away) and my 13 year old daughter was at home. She got scared and I came home but they had gone by the time I got back. I want to know what can be so serious the Police are here in such force - I am not being nosey but as a mother I think I have a right to know. I suspect maybe drugs as it is quite heavy prescence