ILS119.5
You say
"However, I experience many times that the en route centre do not apply speed control at all and when released to us they can be travelling at 350kts @ FL60."
I refer you to your own post (the same post actually),
"If all you Uk trained people can remember the APR manual which states that "speed control is not a good substitute for good vectoring" then we should not have to use it."
So do you want them on headings or do you want them on speeds?
Even en-route controllers cannot read minds. If you are not happy with the presentation of the traffic, talk to the guys and gals responsible and try to be clear about what you want.