Heads up, #AVgeeks of #London - lots of rare birds visiting over the next few days.

Some don't appear on ADS-B exchange, like this Sikorsky VH3-D (Marine One). There were two of these flying right over my house yesterday, at about 400ft, could see the roundel clear as anything.

Also several Chinooks thwomping around. Expect the Blackhawk VH-60 version and some VS-22 Ospreys as well.