I have had a DVLA assessment in December. I have to renew my licence every year and this year they wanted t he assessment.
I rang the place that sent me the appointment and they gave me number of test centre, which then gave me the assessors mobile. I only got it the day before my test and he rang me back and was very reassuring.
On the day my husband sat behind me and the assessor next to me. However I th ink he was also being assessed and he asked if the other guy could come too and so he sat next to my husband.
So three men in a car intimidating!!
But in the end I did ok - got about 8 As and 3 Bs which made up an overall B and I got my licence without them wanting me to have refresher classes. It is still only for another year but i think it unlikely that they will automatically test me again so soon.
Main thing is being aware of the mirror, signal, manoeuvre and distance from other cars. These are what I got my Bs for.
Assessor was very nice and it wasnt too bad and experience,
Good luck with yours - just have plenty of practice driving around the test centre area - maybe wth a friend or partner. Build up your confidence and you should be fine.