Awarded Support Group ESA

Hi

Last thursday i recieved a curtousy phonecall from ESA telling me i had been placed in the support group for 12 months. I was told my claim would be backdated to the 10 november. Ive since had a payment which was still at assessment rate.

My questions are, how soon after this call will i be recieving the decision letter, backpayment and the main phase increase.

Thanks