no one is going to offer you a job without interviewing you face to face, specially if your looking after their kids

western union and to a different person

shipping fee ................................150pounds

tax clearance.................................100pounds

Flight insurance certificate...............950pounds

just scamming you out of money shipping £150 - fedex is less than £50, tax clearance for a passport , flight insurance £950

did you send them your passport ? if not how can they send you a scan of your permit ?

if you did it should look similar to this