I’m like you I’m living at my wife’s rental and have not done a TM30 as when I applied for my visa I put her address down as place of residence. So I take it I’ve already told immigration where I will be!! Don’t see why I would have to tell them again unless I moved 🤷♂️
I had 18 months left when I arrived and have been here one month already so I have 17 months left and will apply next month for extension so will have 16 months left. But read on google that you need at least 18 months left to apply. Which sounds daft to basically have to renew my passport with that time remaining. Was planning on renewing from here in April next year when I have 6 months left.