"I'm not an economist, I don't provide forecasts..."
"The benefits of Brexit need us to escape from the EU. At that point we will start to see the benefits..."

Seems we have two Nigels here, people!

I was not making forecasts. I was clarifying that we will need to complete Brexit before we start to see the benefits. I am not attempting to enumerate those benefits, nor put a value to them. Even so, I am confident that we will see benefits. That is called optimism, not forecasting.