You will also be entitled to working tax credit which will help, I'm ground cabin crew in the same boat and no one tells you what your entitled to you need to go ask and look.
Depending on your situation working tax credit will help a lot and they will do a free calculation if you give them a call (mine worked out about £42 per week) but heard people getting a lot more.
Also found out 2 days ago about a NHS scheme set up called the aliment list (or similar) you register with your local pharmacy and when you or your baby need anything such as creams, cough bottle etc they will give it to you free of charge. It's to help with wasting doctors times for silly things, also if you and your partner are claiming working tax credit then he can get this service to.
I know £117 is not alot but better than a kick in teeth.