A high growth rate is easier to acheive if you start from a low number than when you starting-point has centuries of growth behind it.
A high growth rate is also hard to consolidate with stringent safety-, environmental- and labor-rules.
Freed of all of these, both the EU and the UK could much more easily acheive growth numbers similar to those acheived in Asia today. However; Is this a rabbit hole that we WANT to enter?
I have so far been under the impression that NHS at al is something that the UK wants to keep?