Someone from Uk send me on my mail the opportunity to work in Gwent NP18 1BW, UK. and gave contact numbers?

In email "Secondly, you are requested to print out and sign the contract agreement terms sent to you as a sign of acceptance to the family offer. A copy should be sent back to the family via e-mail and not through courier to avoid delay, while you send another copy to Royal Courts of Justice ociates immediately for swearing of your Affidavit of Good Moral Character through the UK Royal Courts Of Justice here in Wales stating that you are eligible to meet the standards of good character for this caretaker position and also uring the family that once you receive Visa, Work/Residence permit and flight ticket including your advance first month salary of GBP 4,200.00 that you’re going to join your duties as agreed." I am afraid this is a scam. How can i be sure?