Crab,
This link (
http://www.mcga.gov.uk/c4mca/sar-hin...esentation.pdf ) is a presentation given by the SAR-H IPT a few years ago. Slide 29 is the one of interest and states reaching risk areas 1 hr from take-off. Not sure if the requirement has been massaged but it is worth following up.
Regards,
CD