ESA50 form

I have been on ESA and in the support group for a long time now (more or less since ESA started). Today i received a ESA50 form to fill in - not sure why i've been sent it - thought i was in the support group and that's where i would stay. I have always done permitted work and written to the DWP telling how much i can and can't do, how my company supports me and also how family support me as well.I have filled in their permitted work forms twice now and been legitamately doing small amounts of work under their rules.
Anyone else had this happen and do you think this means they are trying to put me into the WRAG section?

Gill

All ESA claimants whether they are in the WRAG or SG will have their entitlement periodically reviewed.

The only significant difference is that claimants in the SG may have a longer time between reviews, but they can still be subjected to the WCA every 2-3 years.

Thanks - that's put my mind at ease!