I don't have a load tester unfortunately..

Ok did some more reading and supposedly you're not meant to load up the charging system on idle, only on fast idle (2000 RPM) so did another test.

Test 3:

Car on with high idle 2000rpm (no load) = 14.71V

Car on with high idle 2000rpm (with load hi-beams, heater, fan, stereo, demister, etc) = 13.90V

Is this acceptable for the charging system?