Living Together and Separation: Sources of Advice
This site is a good place to start if you want to understand the basics. It includes sections on making a living together (cohabitation) agreement and a separation survival guide, and good forward links on to other helpful sites.
AdviceNow has also produced a really useful leaflet setting out why you should make a Living Together Agreement and giving an outline agreement that you can discuss with your partner and fill in yourselves. You can find it here. This is really worth a read.
It isn't exactly a snappy address, but this link will take you to a government-produced PDF leaflet which again has a lot of the basics, including proof, if you need it (either for yourself or to show your partner), that there is no such thing as a "common law marriage".
Resolution is an association of family law solicitors in England who are committed to trying to resolve family law cases in a non-confrontational way. There is a cohabitation factsheet to download and a list of solicitor members by geographical area.
Another massive address, but a particularly good resource if you're worried about your housing rights. There is a downloadable version. Note: this link will take you to the page relating to the law in England. If you are in Scotland, the law is different. Check you have the correct page.
The Law Society's page on things to consider if you are buying a property with your partner.
Acting as a litigant in person
The Circuit Judge Civil Sub-Committee Handbook for Litigants in Person:
Advice Now have posted a really useful video on YouTube all about representing yourself in the Family Court, telling you what to expect, what preparations to make, and -- every bit as important! -- what NOT to do. Well worth a look here.
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