Can anyone shed some light on how there is an increase in the stalling speed in a climbing turn. I cannot see how there can be an increase unless there is an increase in wing loading and I cannot see how wing loading is increased if there is no back pressure on the CC, am I missing something here?
Compared to level flight there must be an increase in back pressure on the CC (assuming it's trimmed for level flight). If you look at the forces in a turn you'll see that lift has to increase to maintain level flight. This increase in the lift force and no change in the weight means that there will be an increase in the load factor, ie: you will be experiencing more than 1G. Stall speed = stall speed @ 1G x sq.root(load factor).
Now in a climbing turn, you'll have different angle of attack on the wings. In a climbing turn, the outside wing has a higher angle of attack which translates to a higher stall speed. You will get a wing drop because the outside wing will stall first.
I should also point out that you can't determine if wing loading has increased by seeing if the back pressure on the CC has increased. I could trim out that pressure and have the airplane fly in a climbing turn without touching the controls.