Think what I'm going to do is leave it until the soil dries out then re pot the plant as i heard it is easier to free the soil from the pot when the soil is dry. Then hopefully it will release itself in one pot shaped soil clump and also the dry soil will more easily release itself from the pot since more moist or wet soil tends to stick to the sides and bottom of the pot which is a bad thing, could break the roots that way.

I'm going to just leave my plant for maybe 5-7 days without any water, just turning the fan and light on & off for the 12/12 cycle then after some time has passed and the soil is good and dry i will re pot it.

This last (third) pot should be big enough (Size 25cm (depth) by 26.5cm Diameter by 20.5cm (Bottom of pot) ) so i shouldn't have to re pot the plant again.

Thinking about it i have a horrible feeling this third pot still wont be big enough for the entire grow however it is the next size up as any bigger pot will drown the roots as mentioned earlier in this thread.

Any Maths whizzes out there know how many liters a pot with the following dimensions is:

Size 25cm (depth) by 26.5cm Diameter by 20.5cm (Bottom of pots diameter)