@wealthysoup
Answering on your questions can push my position within speculation area,
which is not my intention.
Knowing that:
There are, at the moment 1691 FR24 receivers ("radars") in UK
Some in range of that particular incident are:
EGLL
F-EGLL1
T-EGLL98
T-EGLL101
EGLF
F-EGLF1
T-EGLF8
T-EGLF46
EGVN
F-EGVN1
EGTK
F-EGTK3
F-EGTK2
EGGW
T-EGGW95
T-EGGW100
F-EGGW1
T-EGGW125
may be at last 20+ more of T kind around too....
So should be enough F type data for multilateration (4 is minimum) .... and post-processing if
necessary.
If someone is (even officially) interested to request data from FR24 servers,
that is possible and good practice.
FR24 data was used for some high profile incidents, where radar coverage was limited.
For this case investigators can have enough official sources of data, but who knows.
@Bell_ringer that is true in case that number of FR24 sites is low.
I have opposite experience of FR24 overlay on GPS track recorded on
Cabri G2 in Germany with more than fair accuracy, even during autorotation phase of training flight.
Just for educational purpose what is source of my educated guess, public data from FR24 of both flights...
https://www.dropbox.com/s/ucbpxrcmln...52_G2.jpg?dl=0
and another angles, cleared
https://www.dropbox.com/s/p4vbszoiml..._G2_1.jpg?dl=0
https://www.dropbox.com/s/t1lesr05ls..._G2_2.jpg?dl=0
both KML files loaded in Google Earth Pro and screen taken to jpg