I have just done this test, starting charging my Trophy at 78%. It charged at 6.2kw for 14 minutes before it reached 80%, which is what I would expect. Then it carried on charging at 6.2kw for another 4 minutes, dropping to 4.6kw for 2 minutes. Next it entered a variable state, charging between 0.06 & 3.93kw and back again repeatedly, for another 4 minutes. Finally it stabilised at 0.04kw or thereabouts for 6 further minutes, before terminating.
This looks to me like equalising behaviour. The gross power leaving the Pod Point charger was 3.2kwh. If we assume 92% efficiency, this equates to 2.94kwh actually reaching the battery. I estimate that increasing the charge level from 78%-80% took 1.3kwh or so, leaving 1.6kwh unaccounted for. If this wasn't used for balancing, what was it used for?