Graeme Cant wrote:

Because the rule is that ALL powered aircraft ALWAYS give way to ALL
gliders and, in uncontrolled airspace,

There is NO SUCH RULE.

they do this by seeing the other
aircraft and avoiding it. Not by squawking.

All aircraft are required to see and avoid regardless of the right of
way rules.

Unlike the nautical rules, there's no stand-on (priviliged) vessel.
Your required to not hit the other aircraft regardless of the who
has the right of way.


Prima facie, the powered aircraft is at fault.

Like when I hit another car from behind, prima facie it's my fault.

If you flew a glider into another aircraft from behind it would be
at fault. The overtaking rules do not have an exemption for class.