RAF First Line to Second Line Aircraft Colours

[Larry]

I'm sure I have asked this but in the RAF during WW2 many aircraft were
relegated to second line units and some had charmed lives and lived on in training units till 1945. However, if for example, a Hurricane in typical Battle of Britain 'green and brown' colours was sent to a Pilots Advanced Flying Unit or Operational Training Unit in the mid war period onwards and remained in flying condition, would the aircraft we repainted in the later 'green and grey' camo?

I get the impression aircraft were not repainted unless undergoing serious repairs and that the CO would not care as long as he kept up his flying training programme? So aircraft could look quite scruffy.