They appear to be Aerial Sporting and Recreational Activities listed in [URL="http://www.ead.eurocontrol.int/eadbasic/eais-CF32113410796AB17E2284FF5931DB9B/3QDXTD5E6YWTY/EN/2014-05-29-AIRAC/html/index-ead-en-GB.html?target=eAIP/EG-GEN-0.1-en-GB.html[/URL]. Never come across the EGU prefix before though.