Partner's income is not taken directly into account...no direct claim can be made on it.
But having a partner with an income reduces your needs (cos she can help pay bills) so if your case (like the majority) comes down to splitting assets and awarding SM based on needs of you vs needs of your ex/kids...then yes it can make a difference.
Make sure she is not supporting you...let her use her money for holidays/treats etc...keep your own costs (bills/mortgage/food etc) high - otherwise you reduce your 'needs' and reduce your share of the assets and your share of your own ongoing income.
Re: partner putting money into your property...erm I would avoid that for now....Louise11 may have something to say on this as she is a new partner who put money into a property and is now fighting hard to protect what is hers from her hubbies ex-wife who wants whatever she can get of it....wait til after Ancillary Relief proceedings are done and you have a Consent Order in place before you go ahead with her putting money into your property.
You have to state your living arrangements on form E. Is there any reason you need to live together before you sort out ancilliary relief? If not, it would be better to wait until an agreement is reached to avoid things potentionally getting complicated and messy.
It's not that we need to live together, we just want to. my ex will not go to a solicitor and is in no rush therefore it could be a year before all finances are sorted. I am not willing to risk a good relationship just for extra cash.
that said i want to minimise my partners involvement from a financial aspect. Mortgage, bills and insurances are all in my name and paid from my account.My partner has own place but some distance away which she still has mortgage etc on.