It's called 'turn to us' gives estimates of what you can get.
Make a universal application on their website it is really easy and also you may be able to speak with a benefits advisor at your local children's centre sometimes they have a linked advisor offering drop ins
Look at entitled to website and also UC. You’d be surprised what you can get mortgage wise with pt
The best is to apply to universal credit to check what you're entitled to. Your bank can suggest you what options you have with your mortgage
Check the entitled to website