Calculate arc tangents with windows default calc.
also these sites will help as well -
https://www.gigacalculator.com/calculators/arctan-calculator.php
https://www.easycalculation.com/trigonometry/angle-elevation-calculator.php
Basic ground level calc to hub of LE using - 413m to LE, 75m to hub = 10.292 degrees
Not sure about usual custody procedures - but according to reports they are on remand in Wales.
"District Judge Gwyn Jones remanded them to Caernarfon Crown Court for plea and trial preparation hearings on December 7. The judge remanded the three women and three men into custody until then.
Prosecutor James Neary said the defendants are alleged to have “unlawfully and by force or fraud took or carried away a child against his will”. Wilfred Wong, 55, of Pied Bull Court, Galen Place, Camden, London, is also charged with possessing a knife."