Don't be disheartened, I've had 4 tests so far, I have another booked for the 2nd (my 21st B-day). ALL test's I've consistently got 2 serious (all different on every test). I've had 4 instructors so far and all have said I'm more than ready. I've been driving privately for 3 years now and have drove all over the country but still no luck.
My last test - the examiner was a really nice guy. When we got back to the T/C he said to me you've failed and explained that it was because of my observations at a specific roundabout we went on. The weird thing was the minute we stopped back at the test centre his exact words were "your observations were perfect, but I'm failing you for your observations", literally they were his words. Funny thing was, the roundabout in question was because I changed lane, the whole roundabout was empty and I looked all round before indicating and moving over, I even said to the examiner before I moved over "looks clear to me" he responded with "I agree".... Confusing or what!!?? Anyhow, it's massively down to luck so chin up.
Has anyone done their test in Durham?