Cohabitation and finance
The organization One by One has an excellent summary of the history of the law of marriage and an answer to all the clients who claim that they are common-law wives/husbands:
https://www.oneplusone.org.uk/
The Law Commission has recently issued a set of proposals for the reform of the law on cohabitation. The report can be found at https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/228881/7182.pdf