Hi Spreeny,
I'm sorry for your loss.
You don't actually need to change the deeds as when one joint tenant passes, the deed will automatically revert to the remaining party in this instance. (Unless your husband specifically left his share of the house to your children instead of yourself?)
You can however 'tidy up' the deed document if you wish by sending the original or a certified copy of your husbands death certificate to the Land Registry department and they will amend their records to state yourself as the sole owner.
I hope this helps