MegaSack DRAW - This year's winner is user - rgwb
We will be in touch
[img] 
[/img]
This "duo" of Bell 206 JetRangers is in fact just one aircraft but it's transmitting two signals for
G-TOYZ and G-LONE.
Why, what, where etc.?
The front end and the back end as it is a really really long aircraft?
You sure they are not just flying close together ?
They are two separate aircraft (and are owned by different companies:
https://www.flightradar24.com/data/aircraft/g-toyz
https://www.flightradar24.com/data/aircraft/g-lone
But g-toyz is showing some flights as g-lone
https://www.flightradar24.com/data/aircraft/g-toyz#3079799e
So - no, confused too.
Still doing it -
G-Lone
https://globe.adsbexchange.com/?icao=403972
G-Toyz (G-Lone)
https://globe.adsbexchange.com/?icao=404c7b
However, the first one is transmitting as ADSB (giving ID, location and flight stats) while the second one is transmitting as MLAT (giving ID, but requiring multilateration from multiple receivers to ascertain the position.
This is why they / it is not showing identical positions....
Possibly the aircraft transponder is mode s, but the pilot is carrying a portable device such as a skyecho that he has forgotten to set the registration up on...