For ILR you have to show not only that the relationship is still on-going but also that you reside in the UK.

As you spend half your time outside of the UK this may be an issue.

There is no stated residential requirements when you apply for ILR but when you apply for citizenship you will have to show the following:-

Residential requirements


In order to demonstrate the residential requirements for naturalisation you need to:
  • have been resident in the United Kingdom for at least three years (this is known as the residential qualifying period); and
  • have been present in the United Kingdom three years before the date of your application; and
  • have not spent more than 270 days outside the United Kingdom during the three-year period; and
  • have not spend more than 90 days outside the United Kingdom in the last 12 months of the three-year period; and
  • have not been in breach of the immigration rules at any stage during the three-year period.
If you want to contact the UKBA then I would suggest you write to them at

UK Border Agency, Lunar House, 40 Wellesley Road, Croydon, Surrey CR9 2BY