<<I think the mixed use of pressure settings can be a recipe for disaster. However, surely we can just bite the bullet and get on with it.>>
Hopefully not the attitude of professional controllers! If something is that dangerous it needs fixing.
ILS 119.5 wrote: "If you are flying at 35000ft then you should be flying at a flight level of 35"
I think not, but I (think I) know what he means.