@oggie41 make sure you read the comment above that post from @sryke about VT1 and how to train it. Good points there. FWIW I generally do “rides” below VT1 but will design some interval sessions to target slightly above it. I consider those “sweet spot” sessions.
(Also, sorry for the “Americanization” of my version of the test as @bbarrera pointed out afterwards, you could also talk on the phone. You have to really pay attention)