The GB PIC Designated National Authority email address for EDEXIM account requests is UKDNA@hse.gsi.gov.uk
The GB PIC Designated National Authority postal address for completed notification forms is:
GB PIC DNA
Health & Safety Executive
2.3 Redgrave Court
Bootle
Merseyside
L20 7HS
EU Regulation (EC) No. 689/2008 [PDF]
European Database Export Import of Dangerous Chemicals (EDEXIM)