Yes, they would tell you if you'd failed Stage 2. Also, from the NATS website:
"If you were successful on assessment day two you'll be invited to complete an online occupational personality questionnaire"
You said you've taken the tests after Stage 2 so you're all good.
For what it's worth, if you read back over recent months on this thread, there are a plethora of people in the same boat. It's just a case of waiting