Also does Bitcoin ATMs allow you to withdraw or only deposit ? I will have to look into that.
The majority only allow you to deposit but some will allow you to withdraw as well. They are much harder to find though. You can find out where your closest ones are here:
(I am assuming you're in the UK but if not follow the links to your country)
Bitcoin ATMs in UKWhilst the fees and exchange rates can be frustrating, they are nothing on having your funds stuck in an exchange!