Please see the below link, it should take you to the new Crowded Places Guidance published by the National Counter Terrorism Security Office (NaCTSO). It’s user friendly as in if you click on your particular sector on the first page, it will take you to that section and give sound advice.
Please also consider looking at the sections that may interest you outside of work such as Hotels & Restaurants, Places of Worship, Retail etc
Business Continuity Updates 