Karlos!:
Hi
You can cancel policies mid-term but you should phone the companies concerned and not just cancel the Direct Debit payment. Cancelling the DD's is not the same as cancelling the policies.
On the Home Insurance, there may be a cancellation charge, but they will advise you of this when you phone. This will also be confirmed in your policy documemts.
On the life insurance, you should enquire about the cover before you cancel, so you make sure any replacement policy is adequate for your needs. Also they can confirm when your next payment is due, so you cancel from an appropriate date, just in case they don't refund part of a monthly premium.
Huckster