I am sure weecalf wasn't being nasty- it was just a way of pointing out you'd posted it in Crosswords so some of those who can advise on benefits matters may not see it
If you post a question into another category it's not likely to be seen by the people who can help - particularly with the Crosswords category, where it'll get swallowed up in no time.
As far as I am aware you will not get less housing benefit but you could get more. As others have said you have to inform them anyway when you have change to the money you have coming in. DLA isn't treated like any other income.