Your possibly going to get various "warnings" now about eavesdropping on ATC......parts of Europe and certainly the U.K. are tighter on this than the US.
TBH I'm not sure you can train your ear that much by listening, you learn best by doing. I'm not sure if you are training your ear just for hobby purposes or with a view to future training but in any event what does definitely help is knowing the official standard format for calls and basic R/T rules - have you looked at CAP413 (the UK CAA RT handbook) or local equivalent. Link to free download follows.
https://publicapps.caa.co.uk/docs/33...%20MAY16.2.pdf