The current law may be inspected at the URL below. Relevent words in quotes. Updated by regulation 1185 of 2016.
EUR-Lex - 32016R1185 - EN - EUR-Lex
Commission Implementing Regulation (EU) 2016/1185 of 20 July 2016 amending Implementing Regulation (EU) No 923/2012 as regards the update and completion of the common rules of the air and operational provisions regarding services and procedures in air navigation (SERA Part C) and repealing Regulation (EC) No 730/2006 (Text with EEA relevance)
(4)
in point SERA.5001, Table S5-1, the footnote (***) to the table, point (b) is replaced by the following:
‘(b)
helicopters may be permitted to operate in less than 1 500 m but not less than 800 m flight visibility, if manoeuvred at a speed that will give adequate opportunity to observe other traffic or any obstacles in time to avoid collision.’;
Above applies if approved by relevant authority - i.e. CAA in the UK. CAA has not approved it, but in other EASA states it may be.