On mature reflection, and after checking my diary, I now see that I have been staying in the house one night per week since early last year.
This girl moved in to the house on March 15th, and a friend of hers on April 1st. Both are long haul cabin crew and are away from the house a few nights every week. Other occupants of the house can corroborate that I have been staying there.
As stated previously I've also been staying in my home town in the north west looking after an elderly relative, and my job allows for remote working.