Start with a timeline.
Summarise important dates and periods in your relationship. Note any time spent living apart and the circumstances, without trying to fit your story to someone else’s.
Organise what already exists.
Consider the records you already hold about your shared life. Keep originals safe and do not create, alter or backdate evidence. The appropriate evidence is specific to the matter.
Use a suitable document channel.
Relationship material can be highly personal. An initial website enquiry only needs a brief overview; discuss secure document-sharing arrangements before sending sensitive records.