My husband and I are British, married in the UK,

if an agreement has not been made at the time of marriage in the UK whereby the spouses may purchase assets, each on their own, using financial resources obtained each on their behalf - all purchases become 50 per cent property of each of the two spouses, without the identification of each of the two fifty percent - in Italy this procedure is called precisely <communion of assets, pro quota undivided>

The default state in the UK is communcion of goods,  if you didnt opt out then that is what you need to declare.   The notary should know this.  

We are also planning to buy real estate now and I have so many questions. I am very worried that we will not be able to understand this heap of documents.