but just been reading that the ideal humidity level is between 40-60% .
It depends really.
You don't want lower than 30% as that is uncomfortable and some say unhealthy.
At around 30-40% you should not be getting condensation, and if you do you really need to think about increasing or improving the insulation as you need unreasonably cold surfaces for condensation to occur. This low level of humidity is hard for some households to achieve, particularly older properties.
40-50% is a happy medium, it is not too hard to achieve, and condensation should be reasonably manageable, though it will still occur on single glazing, or cold bridges caused by lintels or uninsulated window surrounds.
Higher than 50% and it starts becoming harder to avoid condensation unless you have fairly modern levels of insulation and not much cold bridging.