the CAA said - Heathrow Airport

CAP 1027
Chapter 6: Commercial Revenues
6.9 One significant area of disagreement where judgement is required
relates to the impact from the future ban on tobacco advertising that
will be mandated by the Tobacco Display Act (TDA) from 2015. This
will mean that cigarettes cannot be openly displayed and will have to
be kept in a separate room or cupboard. Point of sale displays will be
limited to simple price lists with no brand images or other promotions.
An impact (size of adjustment) of 40% decline in sales proposed by
HAL but was not accepted by airlines (figure 6.1). There was also
disagreement on whether a total ban on duty free tobacco in 2018,
due to pressure from the World Health Organization (WHO), will
actually occur.
April 2013 Page 95