Yes, the law is currently being reviewed I think, because of the lack of clarity about what can be claimed, but broadly speaking, you can make a claim if the other party has had a financial advantage during the relationship - so (with the caveat that I am not a lawyer) being able to accrue a pension and savings whilst the other has been a SAHP and has no or minimal pension would be an advantage.
The really important part is the need to start an action in court within a year of the relationship ending. This is crucially different from divorce where you can bring an action years after separating. Attempts to resolve something amicably can drag on for months or can be stalled maliciously and a year is not very long, and of course the pressure in any proceeding is to resolve amicably without recourse to court. Of course within that circumstance, establishing the date of separation is also important.
The year applies to if you separate, it is six months if one party dies.
As I say, the law is under review and may become clearer in terms of how financial settlements should be made, so it is worth being aware of, even if you take a while to disentangle and it is theoretical, rather than practical, knowledge for a while.
Lots of legal firms have blog posts and information about what they specialise in, so you can find a good solicitor by doing some research.