Again via Reuters, this from the British Chambers of Commerce latest economic growth forecast

  • 1.1 % for 2018, from a prior 1.3% prediction
  • 2019 to be at 1.3%, prior forecast 1.4%

Citing:

  • "The changes to our forecast indicate that the UK economy is in for a testing period, with persistent uncertainty and the possibility of a disorderly EU exit increasingly weighing on the UK's growth prospects"

At 1.3% that would put growth at its worst since 2008-09's recession