Hi GF
"At Luton, I listen to pilots reading back QNH, I do so if only to fit in. I refuse to be the ugly Yank"
Why do you feel that you only read back QNH "because others do it". You must be able to see the common sense of setting correct pressure what with the number of level bust that occur especially in busy airspace as London TMA.
I personally have seen horrendous lb's because of wrong pressure setting and to get a readback of the setting is a means of trying to alleviate these busts.