Listed are acceptable forms of evidence of relationship / joint place of abode.....

"Your application could be delayed or even refused if you do not provide enough evidence of this
kind.
- telephone bills or statements
- gas bills or statements
- electricity bills or statements
- water rates bills or statements
- council tax bills or statements
- mortgage statements or agreement
- banks or building society statements/passbooks
- tenancy agreements
- insurance policies/certificates or other correspondence
- loan agreements
- AA,RAC or similar membership
- membership of sports or social clubs
- membership of a religious organisation
- correspondence from government departments or agencies (eg HM Revenue and Customs,
Income Tax, DHSS, DTI Work Permits) including evidence that you have declared your relationship
to the appropriate government bodies.
- correspondence from GP or local health authority (e.g. NHS card, correspondence about antenatal and port-natal treatment, letter confirming dates of visits to the home address by a midwife,
letter confirming registration with a dentist, etc – providing these documents show your home
address and the date first registered)"