Dear Honey Cathy
Definately the job is yours!!! Stop thinking negative things and try to see this call for references from another perspective.
Reading some topics here i could realize that Assessment Days differs from country to country.
Last year they asked me during my final interview for 3 references from last jobs i had and this year they changed, just asking for certificates.
So no worries and send your references. For sure they want you and i am very happy you maid it!!!
Congratulations and fingers crossed. I am getting paranoid!!!
Cheers
Dandan