Thanks for the tips - with regards to proving living together, would a joint account bank statement from Barclays suffice or do we need a utility bill? or council tax? Thanks.
For ILR, you need at least 6 documents addressed to both of you, spread evenly over the 2 years (so one document from each 4-month period of the 2 years), from a minimum of 3 different sources (sources include: electricity/gas bills, water bills, phone bills, council tax bills, letters from a GP/hospital/dentist, DVLA, TV licensing, HMRC etc.)
If you don't have 6 documents with both your names on from the required number of sources, then you'll need to send 12 (6 each) addressed to each of you individually (or a suitable combination of joint and individually addressed documents).