My company Op's (as per most other operators) dictate that we must monitor 121.5 on the secondary box. The most frustrating element of monitoring 121.5 as you start flying over mid-France back towards the UK is to hear "practise pan, practise pan,blah blah blah. London centre practise pan acknowledged" I have to flick 121.5 off as it becomes infuriating
Throughout the rest of Europe I never encounter this problem. What happens if the frequency is blocked and there is a real emergency?? Can the UK not provide another frequency for training, like London Info? That would be a good start!!