FLR(M) Housing / Split Living

I live in Scotland during the weekend in a house I own with my partner, and during the week, crash at a friend's place in London.  I'm including in my FLR(M) application the title, mortgage, etc about my owned property, which meets all the requirements. 

However, do I also need to provide evidence about where I stay when I'm in London?  It's a very casual, informal relationship, as he's a good friend of me and my partner, and the extra money helps him out.  We don't have a formal contract.  If it makes any difference, I'm applying at Croydon. 

Someone please correct me if this is wrong, but I would think the only address you need to include is your main residence.  This would be where you receive mail, the address you give when asked for your home address, etc.  I would think your home in Scotland, that you own with your partner, would be your main residence and leave it at that.