Hi guys! This is my first post here, I am asking for advice on weather I would be entitled to an IS underpayment that i know occurred. I was recieving IS on the grounds of being estranged in 2011 after being kicked out of home. I recieve DLA at the middle rate for care and lower rate for mobility. I have a close family friend who looks after me, as I struggle with my ASD in my day to day life and have alot of social anxiety. I cannot go anywhere that is unfamiliar, it just terrifies me! However I am living in my own place, she comes quite often with meals and stuff and to do my washing etc for me. During the time between june - december 2011 i was living in a house on my own, and then moved to a shared house closer to the family friend. When i moved to the shared house i was told I was entitled to the servere disability premium as i lived alone (not counting the sharing of facilities, as i had my own room and my own tenancy agreement) which they gave me. Before i was only recieving the disability premium, not the servere disability premium, however in the first house i did also live alone, and no one was claiming any carer's allowance for me then, so surely i would have also been entitled to that then? Is it possible to apply to have this underpayment paid to me? Or is two years nearly too far gone? It was only recently i found out i should have got it then.. Thanks!