Money received through referring people to sign up for a TV package

Q: Recently one of my colleague asked me if I have TV package, which I have, she said, she is about to join sky but If I refer her then I will get 125£ and she will get 125£ too. I have done this so I'm not sure if that money would be halal or not since I don't know what type of benefit will she get from TV as I don't want to become a chain of any kind of sin. What would you suggest? Shall I return that money to her or shall I just give it to someone in charity?

Wazifa for shifa

Q: How can I increase my sabar and tawakkal on Allah when being diagnosed with a great medical issue. Please tell me any zikr or any surah that I can read to calm myself from this calamity that has befallen me. Please give me any ayah that I could read to make my heart feel at ease.

The new £5 note

Q: It has emerged that in the UK the new £5 notes contain animal tallow. The same is with plastic bags, and other items such as crayons. Would this mean they are najis or would they come under the ruling of transformation?