It doesn't really matter whether you believe you have nothing to hide or not though. They will (presumably) only search through your data if they believe you have something to hide and therefore are starting with the view to find something. Your innocent searches may not appear so innocent any longer.

It's been so widely criticised and yet pushed through by this government. It allows MP's to have higher status than ordinary people which given the expenses scandal etc. etc. may not be a good thing.