Copied.
Will inform my collegues about this.
To be honest though, I never have to change a heading when under UK radar vectoring. Not needed. However, sometimes in "less proficient" area's it is either this or overshooting, which results in a danger situation when parallel approaches are in use... Again I agree that one should ALWAYS ask/ notify ATC when doing any deviations of more than max. 5 of degrees.
just my humble view.