Mike
You are not normally allowed to work while receiving ESA.
You can do Permitted Work, but the work you are doing needs to be reviewed by the DWP, see
here .
I think you have misunderstood the intention of the Work Related Activity Group, you are not required to work when you are in this group (or the Support Group).
I have to say that by working at this time albeit for only 10 hours, you wil struggle to be found unfit to work and therefore eligible for ESA.
Gordon