We were planning to hit the SAR units by email/electronic copies of the brief, rather than in person. If they're CAT A/B traffic etc then the waves would part and they'd get straight across, so Heathrow transits would be rare. We were aiming for our regulars really.
I can't remember the last time I saw a Navy helicopter cross the field.
In saying that, if anyone has contacts in applicable Squadron Ops etc and is happy to PM me, I'd appreciate it.