Your Will is one of the most important documents you will ever sign. Not only do you need to carefully consider what will happen to your estate when you pass away, but you also need to ensure your Will is kept up to date so that it reflects your current circumstances. Doing this will hopefully prevent issues from arising in the future.
There are, however, certain acts which will inadvertently lead to your Will being revoked. One of these acts is entering into a marriage or civil partnership. Unless you make another Will afterwards, marrying or entering into a civil partnership means that your estate will be distributed in accordance with any previous Will or the intestacy rules if you do not have a previous Will. This could lead to your estate passing to someone who you did not want to benefit at all.